Not sure if this is the same/similar thing, but when I have words or phrases in brackets: [ ], they end up with slashes before the first bracket and after the last word within the bracket.
Ex. /[Hello, nice to meet you/]
I found that I can delete the slashes on my iPad and Android phone, But not on my computer, and they show up in the transcript text for the audio and video otherwise. You don’t ever see them in the actual text when you are clicking on words, though. It also only seems to happen when the bracket is in its own sentence section. (Small thing since it’s editable for me, but I wanted to put it out there in case it might be related.)