Couple months ago you worked on the header and made it a lot better. But I have to say it is still not very consistent. Today I visited my website on the Edge browser and I noticed a lot of flickers. In addition to that, sometimes, though rarely, two separate headers appear on the screen and this mostly happens on Firefox and Safari.
As I mentioned the double header problem (which happens in Safari and Firefox) rarely occurs and I can’t tell how to reproduce it. Anyway it’s not a big deal. But if you check the site in the Edge browser you will see the header, including the logo and other elements within the header, flashes while scrolling and that’s the main problem.