Nextgen Gallery Behaving Weird

Hi,

From last few days, some of my nextgen galleries are behaving weird all of a sudden. When I press the next button page reloads but next page does not load it remains on the current page only. And this problem is coming in just a couple of galleries and rest are fine. These galleries were also published longtime back and no recent changes have been made.

Galleries with issue :
http://www.magzim.com/facts-about-breaking-bad/
http://www.magzim.com/15-signs-youre-dating-an-immature-guy/

Rest almost all the galleries are working.

Regards,
Ishan