I’ve seen at least 1 other person post something about this, like @MrOchoa - about not being able to edit his post, and another very similar post but I don’t recall where. I’ve experienced the same issue.
While editing, there will be a small (simple) head and body “emoji” with a pencil over it in the lower right, and the words ‘Edit Conflict’. When you go to save the edited post, you get the message:
That post was edited by another user and your changes can no longer be saved.
Another strange anomaly, I don’t know if it’s related, but there was one post I was trying to edit, and my on-screen cursor (using a PC, Brave browser) seemed to be off from where I was actually typing. I’d push the ‘End’ key, but it would look like it was 1 or 2 characters to the left. Made it really confusing to type and correct words.
Anyway, the whole Editing a post and it allegedly being “edited by another user” might need some looking into. TIA.