This has been happening to me for years (over three different shared hosting platforms).
On the very infrequent occasions that I need to alter the number of
Number of Topics/Posts to display, the
'Always build' checkbox unchecks itself.
It's just been a minor annoyance so I have never gotten around to mentioning it.
Has anyone else experienced this?
(If this is
desired behaviour, it's not
my desire...
)