Phoca Forum

It looks like either there are css conflicts between the Phoca Gallery stylesheets and other stylesheets on your site; or you have set the Phoca Gallery Width parameter (under General Settings) to be smaller than two detail boxes (260px - I think).

Without seeing the page output, it's difficult to say for certain.

Maybe it's a stupid question, but how many columns you have set i configuration for categories and pictures?
Your post looks like "one column" layout.

M.