Search Panel wont show for one table

I have one table where the list page wont show the search panel when I click "Show Search Panel", and if I try to hide any of the columns by un-ticking the show/hide columns box nothing happens. All other tables work fine, just one in particular.
I expect I have some formatting or code somewhere that is breaking this, but I'm not sure how I would go about debugging this to try and find the problem? Any suggestions?
Thanks!