https://en.wikipedia.org/w/index.php?title=User:TheDJ/sandbox&oldid=559712952
Try adding a gallery that was made using <Gallery></Gallery>
Anything following the opening <Gallery> tag seems to be enclosed inside it. Also when saving, the following might apparently occur: https://en.wikipedia.org/w/index.php?title=British_Rail_Class_50&diff=prev&oldid=559199747
Version: unspecified
Severity: normal