ok guys, I've reproduced your error (thanks Grum for the additional info by email). It seems we have a bug with the reviews when the topic goes over 1 page.

I didn't see the error initially because in UserCP > Settings and options > Edit Options > Number of Posts to Show Per Page, I had 20 set rather than forum default therefore the thread appeared as one page for me.

I'm pretty sure I know what is causing this (it's the thanks mod not implemented on the template for page >1 for reviews) but won't have time to look at it until the weekend.

A quick and easy solution would be to switch off thanks for the reviews but I'm not sure how everybody feels about that, I'd rather wait a few days and fix it personally.