- Go to this page: https://he.wikipedia.org/wiki/%D7%90%D7%9C%D7%9B%D7%A1%D7%A0%D7%93%D7%A8_%D7%94%D7%92%D7%93%D7%95%D7%9C
- Edit the infobox at the left side.
- Behold! Some parameters appear both at the left panel (used) and also on the right panel (unused). Specific example, look for the parameters "בן זוג" and "בת זוג"
- If you click the parameter "בת זוג" for example, on the left side (the used one) you will see data. If you click the one on the right side, it appears with empty textbox as if it's new.
- Click on the right side (as if to add param again) on "בת זוג"
- Click again and again -- the parameter will keep being added to the list on the left in duplicates.
And if the page is saved, the parameter is now completely removed.
This has happened specifically in the hewiki but might be related to more than just RTL.