You don't follow me.
I setup to 0.5. I mine 0.5 with my workers. When I receive the payment I don't receive 0.5, I just receive 0.15, so.. 0.35 of fees.
That's the problem.
Thats impossible and a ridiculous high fee

Check your Transactions, you have a "Credit" and a "Debit" Transaction in "Edit Account" -> "Transactions" - you can see every amount there.
I assume you probably did a manual payment instead of a automatic and therefore simply withdrew before you hit the 0.5 threshold. Some people misinterpret unconfirmed and confirmed coins.. round estimates etc