**List of steps to reproduce** (step by step, including full links if applicable):
* When I submit relatively small edits to this page using Visual Editor, it has been duplicating the Infobox despite the fact that I have not touched the actual Infobox at all:
https://en.wikipedia.org/wiki/Henry_Hastings_Sibley
*The Preview prior to submission also does NOT show that I have triggered duplication of the Infobox.
**What happens?**:
* It adds a crazy block of source text, which only becomes apparent after I've submitted the edit:
```
}}<templatestyles src="Module:Infobox/styles.css"></templatestyles><templatestyles src="Module:Infobox/styles.css"></templatestyles><templatestyles src="Module:Infobox/styles.css"></templatestyles><templatestyles src="Module:Infobox/styles.css"></templatestyles><templatestyles src="Module:Infobox/styles.css"></templatestyles><table class="infobox vcard"><tr><th colspan="2" class="infobox-above" style="font-size: 100%;"><div class="fn" style="font-size:125%;">Henry Hastings Sibley</div></th></tr><tr><td colspan="2" class="infobox-image">[[File:Henry_Hastings_Sibley2.jpg|frameless]]</td></tr><tr><td colspan="2" class="infobox-full-data"><templatestyles src="Module:Infobox/styles.css"></templatestyles></td></tr><tr><th colspan="2" class="infobox-header" style="background:lavender;line-height:normal;padding:0.2em;">1st [[Governor of Minnesota]]</th></tr><tr><td colspan="2" class="infobox-full-data" style="border-bottom:none"><span class="nowrap">'''In office'''</span><br />May 24, 1858 – January 2, 1860</td></tr><tr><th scope="row" class="infobox-label" style="text-align:left">[[Lieutenant Governor of Minnesota|Lieutenant]]</th><td class="infobox-data">[[William Holcombe]]</td></tr><tr><th scope="row" class="infobox-label" style="text-align:left"><span class="nowrap">Preceded by</span></th><td class="infobox-data">[[Samuel Medary]] <br />as Territorial Governor</td></tr><tr><th scope="row" class="infobox-label" style="text-align:left"><span class="nowrap">Succeeded by</span></th><td class="infobox-data">[[Alexander Ramsey]]</td></tr><tr><th colspan="2" class="infobox-header" style="background:lavender;line-height:normal;padding:0.2em;">Member of the <span style="display: inline-block;">[[United States House of Representatives|U.S. House of Representatives]]</span><br />from [[Minnesota Territory]]'s [[Minnesota Territory's At-large congressional district|at-large]] district</th></tr><tr><td colspan="2" class="infobox-full-data" style="border-bottom:none"><span class="nowrap">'''In office'''</span><br />July 7, 1849 – March 3, 1853<br />(Delegate)</td></tr><tr><th scope="row" class="infobox-label" style="text-align:left"><span class="nowrap">Preceded by</span></th><td class="infobox-data">'''New district'''</td></tr><tr><th scope="row" class="infobox-label" style="text-align:left"><span class="nowrap">Succeeded by</span></th><td class="infobox-data">[[Henry Mower Rice]]</td></tr><tr><th colspan="2" class="infobox-header" style="background:lavender;line-height:normal;padding:0.2em;">Member of the <span style="display: inline-block;">[[United States House of Representatives|U.S. House of Representatives]]</span><br />from [[Wisconsin Territory]]'s [[Wisconsin Territory's At-large congressional district|at-large]] district</th></tr><tr><td colspan="2" class="infobox-full-data" style="border-bottom:none"><span class="nowrap">'''In office'''</span><br />October 30, 1848 – March 3, 1849<br />(Delegate)</td></tr><tr><th scope="row" class="infobox-label" style="text-align:left"><span class="nowrap">Preceded by</span></th><td class="infobox-data">[[John H. Tweedy]]</td></tr><tr><th scope="row" class="infobox-label" style="text-align:left"><span class="nowrap">Succeeded by</span></th><td class="infobox-data">'''District abolished'''</td></tr><tr style="display:none"><td colspan="2"></td></tr><tr><th colspan="2" class="infobox-header" style="background:lavender">Personal details</th></tr><tr><th scope="row" class="infobox-label">Born</th><td class="infobox-data"><span style="display:none">(<span class="bday">1811-02-20</span>)</span>February 20, 1811<br />[[Detroit]], [[Michigan Territory]]</td></tr><tr><th scope="row" class="infobox-label">Died</th><td class="infobox-data">February 18, 1891<span style="display:none">(1891-02-18)</span> (aged 79)<br />[[Saint Paul, Minnesota]]</td></tr><tr><th scope="row" class="infobox-label">Political party</th><td class="infobox-data">[[Democratic Party (United States)|Democratic]]</td></tr><tr><th scope="row" class="infobox-label">Spouse(s)</th><td class="infobox-data">Red Blanket Woman<br />Sarah Jane (Hume) Steele</td></tr><tr><th scope="row" class="infobox-label">Profession</th><td class="infobox-data">Fur trader<br />Politician<br />Military leader</td></tr><tr><th scope="row" class="infobox-label">Signature</th><td class="infobox-data">[[File:Henry_Hastings_Sibley_signature.svg|alt=|128x128px|Henry Hastings Sibley's signature]]</td></tr><tr><th colspan="2" class="infobox-header" style="background:lavender">Military service</th></tr><tr><th scope="row" class="infobox-label">Allegiance</th><td class="infobox-data">[[United States|United States of America]]<br />[[Union (American Civil War)|Union]]</td></tr><tr><th scope="row" class="infobox-label">Branch/service</th><td class="infobox-data">[[United States Army]]<br />[[Union Army]]</td></tr><tr><th scope="row" class="infobox-label">Years of service</th><td class="infobox-data">1862–1866</td></tr><tr><th scope="row" class="infobox-label">Rank</th><td class="infobox-data">[[File:Union_Army_brigadier_general_rank_insignia.svg|35x35px]] [[Brigadier general (United States)|Brigadier General, USV]]<br /><span class="nowrap">[[File:Union_Army_major_general_rank_insignia.svg|35x35px]] [[Brevet (military)|Brevet]] [[Major general (United States)|Major General, USV]]</span></td></tr><tr><th scope="row" class="infobox-label">Commands</th><td class="infobox-data">District of Minnesota</td></tr><tr><th scope="row" class="infobox-label">Battles/wars</th><td class="infobox-data">[[American Civil War]]<br />[[Dakota War of 1862]]</td></tr><tr><td colspan="2" class="infobox-below" style="border-top: 1px solid right; font-size: 95%"><div></div></td></tr></table>
```
**What should have happened instead?**:
* It shouldn't have added all that garbage which I didn't add! I didn't even go anywhere near the Infobox in the visual editor and was editing something minor much lower down on the page. (I tried this a few times so have managed to reproduce the problem.)
**Software version (if not a Wikimedia wiki), browser information, screenshots, other information, etc.**:
* Using Visual Editor, Chrome, MacOS
Thanks for your help!