Safari browser APP -> Fixed element is hidden when top bar popping-up

Hi there,
I have created a mobile menu. I have used a grid and I’ve fixed the element on to the bottom. When I’m visualising on webflow or on my google chrome desktop it looks perfect, but when I’m using my Safari App the mobile menu is hidden while I’m scrolling because the bar is popping-up.
Any idea how to fix it? I don’t know why other projects that I have are working well.

Thank you,