Even so, ammending my previous calculations:
If you are say partnered with QuizGroup and you are on an 80/20 split you would be receiving 80% of your earnings. 4,685 monetized playbacks at £0.55 would be around £2.50. If you are on an 80/20 split and receiving 80% of the revenue that would be (£2.50/100)*80 = £2.00
Now see PayPal fees: prntscr.com/6bbq53
Lets assume you are on the lowest possible fees: 1.4% and £0.20
(£2.00/100)*98.6 = £1.97 £1.97 - £0.20 = £1.77
At the end of the day you are complaining about ~ £0.30.. That money is almost certainly lost in currency conversion as Google will pay QuizGroup in their local currency. Then (im guessing) QuizGroup send the payments in USD $ and then you would convert that to GBP £
So your earnings would have been sent to QuizGroup inRUB (Russian Ruble) Then they would convert it into USD (US Dollar) to send it. Then you would have converted it into GBP.. that's most likely where the missing £0.30 is.
Hope that helped.