Before I go running off to put too much time into figuring out what might be causing this, I wanted to ask how many others have noticed it.
The problem I am seeing (and its becoming more frequent, if anything) is working with text, quotes or other blocks in close proximity to OTHER blocks or objects in a post. I.E....A source tag after a quote, and then transitioning from the Source link into regular text again, for example. (Return sometimes does it..and sometimes, it mixes them up)
It's getting more frequent where a backspace in a poorly timed moment or placement of a tag will overlap INTO the other nearby one.
I just had a thread OP where a quote literally became entangled with the image post itself, and even the BBCode view was too hopeless to sort out. I just had to dump that whole section from the BBCode view (no way I'm going to hope it figures it out in preview mode) and start over. I ended up mending and healing my poor OP almost entirely in BBCode view.
That's annoying for me, but then, I am writing OPs a bit more than most. So, this may be a problem I'm seeing (or config on my end is creating?) that others aren't.