Um. Thanks, I think. Actually, this is over my pay grade, lol.If I click "reply" on two different posts, both will get quoted in the reply.
If I then delete parts of both, I can end up with effects like that.
(If I mess with the option to "toggle BB code," I can see the actual bits of code that tell what should be attributed to who, which I usually find more cumbersome, but easier to fix if it does weird things. The strange effects happen when it's showing the quote in a nice blue box, and it makes assumptions about how to handle it as I delete and add things.)