Hi!
Thanks a lot for your reply. But maybe I’ll show in it in a real sistuation. So there is a link to my website where I’m testing YAK: https://www.besturl.eu/ On the left there is a sample product so try to buy it and you should see what’s going on. I uninstalled plugin .php on pages cause I thought it could be a problem but it didn’t help. What is more my link structure is fixed as: /%category%/%postname% but when I used a deafult setting it also didn’t work.
I’m waiting for your suggestion.