Glitch/ Difference in my company's website?

I designed the site from google chrome. The homepage shows correctly on there but when I pull it up on Safari, the Logo overlaps the welcome text. When I go to a different page and then back to the homepage, it looks how it should. But I'm not sure why it would be glitchy like that on Safari. Could it be something to do with padding, overlay or content inset?

I have 2 images below showing the issue. On the left Chrome & left Safari.  

Sorry top chrome & bottom Safari. On another note, could it just be my computer? I want to know if it's showing that way on other computers too...

Hi @Autum  Chrome looks fine on my computer, but Firefox is overlapping like the image above.

It's very jumpy on mobile when you start scrolling the page.

Do you have some extra code installed that's causing the issues?

There are certain forms attached in code on some pages!

I don't have a solution but I can confirm that I am seeing the jumpy mobile and overlapping on Safari.