I prefer to use HTML when posting. I am not entirely familiar with UBBCode, though from previous experience with it, UBBCode does not allow me the same expressive power the HTML provides. Having said that, I understand that using UBBCode may the undesirable solution to my problem.
On occasion, I find the need to edit my posts to correct a spelling mistake I initially missed or add more information. When I do edit my posts, my previously entered HTML markup is shown as content in the preview pane, and any additional information also exhibits the HTML tags when I commit my changes.
Aside from using UBBCode or replying to my own posts, which feels contrived, updating the board to allow HTML in editing posts would be a welcome feature.
I have also noticed similar behavior when someone quoted one of my posts marked up in HTML.
Now it is not exhibiting this behavior. It crops up however.