I only have a second so I can't nail it down, but for the others checking out this thread:
It appears that the logo is horizontally responsive--that the header background (CSS on page, line 41) isn't set to a position so it's moving around based on how wide the window is.
For me, it appears to be too far left, but if I reduce the width of the window, it eventually lines up. My guess is one monitor is wider than the other?
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