The “This month” amount is what you will get around 20iest of next month (payout is always around 20iets of following month). Note some payment methods may require a minimal 200 dollars earned before payout (not so if Paypal is set as payout method).
The “Average” amount is something that gets calculated over period of time and is there just to inform you. Same for “Lifetime” amount, just info. Think of it as your average score and total points made in your game ;-)