This can be due to many factors independent of our module, in doubt, the first thing to do is to graft the module on the hook Header. In the module configuration, click on the “Add” icon in the top right corner, then add and finally specify the module and the Header hook. The module normally works on the actionDispatcher hook but this is sometimes incompatible with some URL redirection modules.
If your shop has a lot of custom overrides, this can also have a big impact.
Another solution is to create an override in the FrontController class (override/classes/controller/FrontController.php) with the following code, it is however not very recommended:
Note that Pretty URLs very often cause problems and there is little we can do about it. The way this module has been made is simply incomprehensible in 2020 and totally deviates from the way Prestashop should work. If you own this module and use it with ours, we will try to help you but don’t expect miracles.
Far be it from us to make forced sales, but it is clear that our URL rewriting module works with this one, just like the other redirection modules.