
The size of the <body> here is 603x436.
Update: reproducible in Chrome 58 and Firefox 53.
This is an easy fix.
In the page's home.css, lines 626 and 680 have media queries that hide the menus at different widths (600px and 650px, respectively). Just setting them to, say, 600px and 601px respectively, it makes the menus show and hide without conflict.
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Fixed in PR, thanks for waiting...
Most helpful comment
Fixed in PR, thanks for waiting...