NEED HELP with bug

Hi there wordpress savies… recently a friend asked me to help him with a bug at his wordpress site that the “programmer” he contracted were not solving (not sure if he is really a programmer or just a wordpress enthusiast like me).

Here is the problem.

The site he runs is this:

https://www.fitcuisine.com.br/

The bug happens whenever you click on any product displayed at the homepage… it start loading that product’s page but didnt actually finish it, opening only the background (I tried to open a product page from the pages tab at the dashboard and the same happens).

Any idea what could be happening here and how to solve it?

Thanks a lot for your help.