Section doesnt fits 100vh / 100% screen – Header problem?

Hello! Im having this issue with all the first sections of the website im developing. When i set the height of the first section too 100vh this doesnt happens, it doesnt fits 100% of screen. I believe its because i set -147px of top margin because i want the header with menu to be on top of the section with the transparent background, you can see it if you enter the link. Same happens with homepage and all other sections: https://www.gualtallarywines.com/home-altus/

You can have a look here of what i mean: https://ibb.co/0qS5k04

In mobile version is almost OK, just a few pixels, but you dont notice it as much as in desktop version.

Any help regarding this issue will be appreciated!

Thanks in advance!

The page I need help with: [log in to see the link]