When you kill a mob in a group, the xp from the mob goes into a pot, and it's then divvied up to each player according to how much raw experience they have accrued thus far on their character.
If your char has more total xp, ie is higher level and/or you have a massive xp penalty (ether class or racial), you get more xp from the pot, leaving less for others.
This is why hybrid xp penalties hurt the group (though hybrids may increase the kill rate so much that it more than makes up for this).
Those xp calcs are good resources. I don't think they are an exact match to p99's code but they're reasonably close.
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