Click code button opens 3 (or more) links?!

Hi, something strange just happened.
My site was working fine, but just when i putted google analytics to my website the trouble started..

I putted in a google analytics code to my (Coupon Theme) website by going to: general setup – Footer&Analytics and i activated it.

After that, when i click a button on my website to see a coupon the webshop opens like normal, but then 4 or 5 times at the same time instead of once!

Of course i removed google analytics from the general setup section, but the problems are still there! Please see my website (https://www.krijgdekorting.nl) and click on one of the [bekijk korting] buttons.

Maybe it has nothing to do with the google analytics stuff, but the only think i did was putting (and removing) this code…

HELP!!!