Search button not work in mobile version

Hello,
I have Opencart version 2.0.2.0 with Journal2 installed for my store http://kordelaart.gr/.
Everything seems to be working for my site except the search function when I'm in the mobile version only. It works in the desktop version, but in the mobile version, clicking the button or pressing enter does absolutely nothing.
I've searched everywhere for a solution but can't seem to find an answer.
Any help would be appreciated. Thank you.

https://www.journal-theme.com/
should be able, to assist!
Ernie