Problem with scrolling from mobile

Hello dear community,
I have a bug to be fixed, but I cannot find the solution.

I have a website which has been online for a while which has now an issue. When I try to scroll every page of the website from mobile I face a problem. I scroll and it firstly doesn’t work, than after a couple of attempts it works again. It did not have this issue in the past, but now it is some months that I get this problem.

Anyone can help? I have to upload the new version of it extremely soon!

This is the website, if you want to check from mobile:

Hope any of you can help!
Thank you very much!!!