Mob XP is based on the average level of the party.
30+30+30+30+14/5=26.8. The dungeon is calculating your average party level at 27 and you're killing level 17-20 mobs.
With 4x level 14's and one level 60 your average party level would be 23 which would yield much higher XP.
Also, deadmines isn't the best dungeon for boosting since many of the mobs in the first rooms aren't elite. You're better off moving to stockades at 15. You can pull the entire dungeon with a decently geared paladin or mage.
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