Images do not change correctly on variant change

[TrendBlend]

Hello I got this issue where my images do not change with my variant images, they are correctly setup in Products > Variants. I've assigned different pictures to different variants. But they do not change when I click on another variant. URL: trendblend.eu/collections/mode/products/vibesync-led

[TrendBlend]

Hello sir, this theme is uploaded by a friend of mine. I checked theme customizations and did not find anything there. I also tried to switch browsers to check which also did not work. Could you maybe have a look into the theme's javascript for me please?
Kind regards, Stef

[TrendBlend]

Also @Margaret3 , I noticed that URL, prices etc are switching so I do not know why the image is not switching itself.