Had a user report this and I could not duplicate it... then it happened to me though I don't know what I did to cause it.
(https://i.imgur.com/bXv4iO7.png)
Is this some kind of timing issue?
While posting this, I went back and it then worked normally.
Forum is pretty basic, no real modifications
using current: SMF 2.0.14
https://www.simplemachines.org/community/index.php?topic=554346.0
Thanks, that fixed the problem.