Another user problem can occur where you have multiple tabs open on the same topic. Especially if you are editing the same post on two or more tabs simultaneously. If you edit one tab and edit another, the last edit posted may over-write the previous edit removing any of those changes.

When I post a thread with multiple pages, and order and change photos, descriptions and comments, I have done this myself more than once. So a disciplined editing process is needed, and re-editing as needed.

Back to the original posters comment, if the sending of data had not gone through and the user without realising stopped his internet connection, it certainly would fail to update the forum database.