Page 2 / Post #11 goes missing

I am having a recurring problem with the forum software.

I see a thread come up in New Posts but when I click it there are no new posts, yet it remains in the New Posts list. When this happens there is a post that does not appear in the normal forum view, but if I use Show Printable Version it appears. I believe it is always the first post on a page, like post #11 that would open page two. This is currently happening with these two threads:

https://www.m4carbine.net/showthread...Buffer-Weights

https://www.m4carbine.net/showthread...Pro-M-LOK-Rail

The invisible posts in each are 05-07-23, 04:32 Circle_10 and 05-06-23, 04:11 Sidneyious respectively.

Now page six of this thread is invisible unless I am in printable mode:

https://www.m4carbine.net/showthread...e-you-seen-IRL