Navigation menu

I am currently experiencing an issue on one of my websites
I created a new nav nestable menu. everything seems to work fine when I inspect it on Google Chrome. However, when I check on different devices the menu doesn’t respond properly.
for instance on my mobile phone on some pages, I can see the menu responding accordingly and on some pages not. On the tablet is only the contact page that seems to work fine. on the Safari browser, the same page responding the rest are not. Do you have any idea what might be causing this issue?
thank you for the time to read my message.