Multiplayer experience question

A friend and I are playing through together with just our two PCs, but his experience keeps lagging behind mine. I thought it is supposed to be a completely even split, am I wrong or is something weird happening?
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The split was a couple hundred, which is too much since any remainder would only put me up by 1xp point per thing killed, and we've got less than 200 total kills. Weird stuff it is, thanks for the help guys.