I think this is related to your issue…
https://www.wix.com/velo/forum/coding-with-velo/some-news-about-the-code-completion
https://www.wix.com/velo/forum/coding-with-velo/wix-editor-gone-crazy
Shay W (Moderator) will surely take a careful look at it (if not done yet).
Follow the post to be uptodate.