working on wordpress I just realized that some buttons are not working properly on the Mobile Web, but only when I use a phone, if I test the mobile version on my pc, works perfectly fine. I tried different solution, but I can't find a reason what is going on, I deleted the cache but still not working.
Do you have any suggestion, of what could I do?
When you test on your PC, are you sure the screen is exactly the same size as the phone you are testing with? Usually, if a button doesn't work on a smaller screen it's because an invisible element is overlapping it.
On your PC, I'd try inspecting elements around the button to see if there is something (like a div element) that might be sliding in to cover the button at certain screen sizes. You might also test on your PC using all the mobile screen size options it has, especially the smallest one, to see if you can get the problem there.
To more fully rule out this possibility, assuming you aren't in a production environment (in which case you could create a test page to try this on), you might add some CSS styles to button to make its position fixed, its z-index 99999999, and top, left, botton, right = 0. This way, the button should fill the screen and you should be able to click anywhere on the screen to test it.