widget modification ?!

i have the vezicazare.ro on the homepage you can see in the right side a city selector ( multicity widget ) that work’s corect but the thing is that when you select let’s say bucuresti it changes the map an then if i wan’t to enter in categories ( another city ) let’s say alba it won’t show any posts but if i enter in bucuresti category it’s ok .
if i take down the widget the categories work’s fine
Does anyone know what could be done for the widget to act only on the map and not disturbe de categories ??