Why does the 'Next' button only work on 1 view and not the others?

I'm sure there is a really simple reason why... but i can't figure it out...

next button doesn't work here:
http://uniteddesigngroup.com/top-rated

but works here:
http://UnitedDesignGroup.com/category/work/photography/bands-musicians/j...

any advice greatly appreciated...

thanks!