Not responsive on mobile

Hi guys, so i’ve purchased the premium Social Gallery. but when i try to access my pictures through my Iphone 5s, the images are not responsive! I cant even make them smaller with my fingers “zoom out”.

Can someone please let me know to fix this? its becoming really frustrating

Here is a link to one of the galleries: CLICK HERE

Thank you

https://ww.wp.xz.cn/plugins/social-gallery-lite/