Dropdown menu not working on mobile phones ?

[blaz1988]

Hi,

I'm owner of web shop implemented in Presta , called  http://trgomania.com .

Month ago  drop down menu for size and colors stop working on mobile phones. It works normally on PC.

e.g.

you can  open with mobile phone http://trgomania.com/bandage-haljine/20614-bandage-haljina.html  and try to click drop down menu under

"VELIČINE" .

You will see that drop down menu will quickly disappear .

Anyone has any idea how to fix it?