No bug. Barbarians will give you xp up to 100, but not beyond (in the same way that in base BTS, they give up to 10xp). If you attack a normal enemy unit, it ought to work fine.
BTW, this is a ineffecient way to contact me - I don't get notifications from it, I just come by ever so often to see if anythings happened. Posting here: Forums.civfanatics.com or here: Realmsbeyond.net I generally check daily.
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