It means in AI spots you've been lucky. Here is a potential example:
You get all-in preflop with AA for $10 against KK. You win. You've been lucky. Since you'll only win about 80% of the time in that situation you've been lucky to win 100% of the pot. In the case of this one hand your $$ won line says you've won $10 but your AIEV line says you should have only won $8.
Advice: Turn off the EV line and never worry yourself with it.