I am pretty good with CSS but can't find the culprit of the fix. If you click the link you will most likely (haven't tested this bug in all devices and screen sizes - i see it in Chrome on Mac) see the upper left logo and menu items shift back and forth about a pixel.
I was working on page speed and one of those plugins did this. After deleting all four of those, it still is doing it. (The link below they are still activated, but i tested with another staging site deleting them and it didn't change.)
Needless to say lesson learned about making backups and / or using staging site to test plugins like those. Or in this case a staging staging site!