Broken screen resolution data (no replies)

I've noticed a lot of broken screen resolutions in my Piwik 2.14.2 visitor log today:

Firefox
Mac 10.8
Resolution1440.0000

Chrome
Windows 7
Resolution1848.0000

Firefox
Windows XP
Resolution1279.5652

Internet
Windows 8.1
Resolution1366.0499

Internet
Windows 7
Resolution1920.0000

Internet
Windows 7
Resolution1600.5x90

Is that related to [github.com] ?