Board Thread:General Discussion/@comment-179.156.155.234-20190715194424/@comment-168424-20190717181229

Try using a different editor and see if that makes a difference. The Visual Editor is super buggy and can be affected by upstream custom JS on a wiki.

If the problem goes away, you've at least narrowed down the problem to the VE.

You could also continue using the VE and see if it behaves differently depending on the wiki.