Okay, I already have Pinbin on another site and decide to install on my main. After customizing I noticed the menu doesn’t show on the category pages.
The css I used on my main site is the same I use on my other site, who still have the menu working on all its pages. But just in case I cleaned the Edit CSS page, uninstalled the theme and installed again. The menu still doesn’t show on the category page.
This seen to be a problem with the custom menu, if I don’t create any menu all the pages show on the nav bar without problem. But when I create a menu, pages or category pages on it, it stop working.
I figure the problem, is not a theme problem, I tested with other themes and the same happened. I think some file must have got corrupted and caused this problem but is already fixed.