It happens !
When I had it do that to me, I had posted and the forum took me to the "Main" sign in page and I backed up and not thinking about it it said it could not unless I resend the data, I hit "refresh" and it double posted -- but this last time it put me back on the thread page !
I know after posting (and clicking to watch) the forum comes up with a page (most of the time) that has "return to thread or go to the main forum", but I have clicked both and not have it do what I want it to.
I think that all that should be done away with and just plant people back on the page with the thread they were on, posted to or watched and I tell you why;
Somebody may have
posted as you were typeing and you could miss it alltogether, yours being after theirs (your name as the last poster you don't see "next to last"

. I have had that happen so many times it an't funny. Sometimes (other forums) I have posted and 3 or more people have posting as I typed

Then I have to post again and they do to and it just gos on and on.
I know if people are not looking out for that they
will miss some.
(Could be an "A" to their "Q" too.)
-And I really don't know how to watch out for it but to check you post again, someway,somehow.
Ok, one more thing, I had to edit this post for wording (most times it is spelling

) But that darn Edit button hates me, it gos to the same "Main" sign in page. More times than not.