thanks for the PM. This needs some further testing.
The problem here is in when you edit a posting, that was before written as html message with an html editor. And next because you're on a mobile device you edit the post with an BBCode editor the posting is automatically converted from html to bbcode.
Which should work in most cases by my converter. This should also work in the other direction. from BBCode to HTML.
I do more testing in the next days to optimize the converter, and this will be hopefully fixed in 2.2.4.3