[@netweb Keymaster 12 years, 9 months ago]

Ok, that’s pretty weird, your other forums appear to work fine as do topics even in that forum.

Can you try switching to the Twenty Thirteen theme and see if it still occurs.

Also can you try changing the ‘Topics per page’ setting for bbPress down to 2 or 3 and see how that behaves (try this with both your theme and the Twenty Thirteen theme).