I think you’re on to something Chrishajer! But I have already listed my plugins above, and none of them affects counting – that I know of.
There must be some sort of bug in BBpress v. 1.02. Thats what I use.
Cause how come this only happens occasionally, and not all the time. If you try to post there, you can see for yourself, that eventually, page 7 will appear. Try posting one or two times, and it will trigger the creations of Page 7.