I have solved the glitch, and yes, I can confirm it is a glitch now.
You all made a great call bringing up the off-hand penalty as, and I never even thought about this, I swapped tongs in the offhand to see if it'd do anything and lo and behold, the 20% went away.
Thanks a whole bunch, I saw some pointers towards this same glitch but didn't see anyone mark the solution as "toggle something in your offhand to reset".
The 20% penalty didn't revoke itself on restart or anything of the sort. Only by interacting with the offhand. Now, whether or not this particular glitch should be lumped in with Xskills, or added to the issue tracker? I can't say for sure. Either way, thanks once again for the directions
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Laholder's post in 120% Hunger Rate bug? was marked as the answer