I do a campaign journal for my group by typing in notepad++ and then copy and pasting over into roll20. I had been copy and pasting then looking for misspellings by them being underlined in red, right clicking and selecting the word I wanted and continuing on. I just noticed that if you do that it reverts back to the original misspelling once you hit save even though it appears to have been corrected. However, if instead of using the right click functionality to fix it and typing the word again it will stay. This happens on both edits and new posts. Easily recreated. Using Chrome and Windows 10 if it matters.