Product variant not showing in front-end

[PrestaBaby1]

Hello,

I'm using "SnapShop" (a paid theme). My prestashop version is 1.7.7.1

When I'm making product with combinations, shirt with 2 colors for example - only the default comination is showing. Even I select the other color, nothing happened, even url is not changing and variation's images is not showing-up.

 

Example with images -

 

Steps:

Backend - make product with sizes and colors (black,white,pink) - https://prnt.sc/zmlux0

Going to product page - https://prnt.sc/zmlzep ; לבן=white , שחור=black

The default selected is White, is showing in the small thumbnail under the black shirt. In the url you can see default values: https://prnt.sc/zmm83j

When I try to select the other color, the image is not changing and also the URL - https://prnt.sc/zmmcph

I changed to Pink (ורוד) and NOTHING happend ; URL not changed and the images is not changed - https://prnt.sc/zmmilq

 

Can somebody help?

Thanks!