Drop down reloads page when clicked ONLY in WHMCS, works on regular site

[Blu_]

Hello! I'm having some issues with my dropdown menu. On my regular front end site it works perfectly but on the WHMCS theme it has some issues.

 

On seen on http://hostgrab.net/ in the top right hand corner the dropdown that says "Billing".. Once clicked the dropdown works fine..

 

But seen on http://billing.hostgrab.net/ in the same location, once click it works fine, but on any other page such as:

http://billing.hostgrab.net/announcements.php

http://billing.hostgrab.net/knowledgebase.php

http://billing.hostgrab.net/serverstatus.php

 

or anything that's not the WHMCS root directory it redirects to http://billing.hostgrab.net/# instead of the drop down working.

 

Please help.. Have no clue whats the problem, maybe a js conflict.. I can't find it though.

[Blu_]

Can anyone figure out my problem? Still this problem haunts my WHMCS theme..