Deleting threads from page one, posts not moving accordingly?

Hi,
Not sure of the best way to explain this, but there's a thread that requires only a few posts on the front page at any time - I was a bit slack at deleting the posts, and they spilled onto page two.
Now, even though page one only has 4 posts, there are still two pages of discussions. Any way around this please!?
Thanks
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Comments
that might be it
I'm just a fellow user so I've no backstage insight I'm afraid