Hey Yame,
For some reason the YITH product add-ons plugin is interfering with the javascript for the Slick Slider. (screenshot attached)
Normally the slick slider javascript grabs the images and puts them into a slider gallery.
When the plugin is activated, you can see that the gallery images are not being manipulated in the same way (the classes have not been applied (1)).
However, the javascript is definitely still running, because you can see the data-attr_slick (2) in the parent element.
Could you advise?
I've also noticed that the size drop down menu has also changed, this could be linked to the above. Could you offer a function I could add tot he functions.php file to overwrite the dropdown and convert it back to a radio/ text style input.
Example of product page here: https://www.publicfibre.com/product/elliott-high-top-r-canvas/