Are you in AE missions? Patrol XP does not get applied in AE missions.
Let me never fall into the vulgar mistake of dreaming that I am persecuted whenever I am contradicted.
~Ralph Waldo Emerson
"I was just the one with the most unsolicited sombrero." - Traegus
XP hates you.
I was just running radio missions. Forgot to mention that in my original post.
Some enemy groups are worth more XP than others, too. I don't remember where to find the weighted chart. Will look for it and post back if/when i find it, unless someone else does first.
Curiousity piqued: what group were you fighting? Freakshow?
I was fighting hellions on the radio mish. (specifics- I was level 14 the hellions were 15)(the mish was get the claw of doom)
Ok, Found the guide.
Thanks, Culex!
Hellions? interesting, they're supposedly only worth 50% standard lvl xp per mob. wonder if the devs fiddled with exp since Culex wrote this.
Edited to add: Were they really hellions, or were they outcasts? i know the early teens is when radio mishes can go either way, and outcasts are worth more xp than standard (120%) according to Culex's guide.
They were really hellions, chose them because they took extra damage from my ice blaster
Wild. Smarter brains than this poor sick girlie's will have to conjecture why that's happening, then. On the other hand, grats on the unexpected bonus 
You should give the extra XP back. Farmer.
Are you level-pacted to someone? Do you have a running day job that gives an xp bonus?
www.paragonwiki.com is a great source of information for this game.
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I just noticed this on a mission I was playing yesterday; Either patroll xp is working incorrectly or something else. Yesterday when I was fighting some enemies that were conning yellow (level+1 minions to be exact) the first one I defeated (18 patroll xp at the time; not enough unless I fought a grey conning enemy-besides the point though) gave me 72 xp. The second one and on throughout the mish only gave me 53 xp with no decrease to my 18 patroll xp. According to paragon wiki's xp chart I should of only earned 43 xp from the minions. That's not the half of it though, when I defeated orange conning lieutennants I was recieving 172 xp for each one. I get my 'I should recieve this' from paragon wikis xp table.