Being charged more than expected for Random Number Generation using Provable

I have implemented provable going off the following example – https://github.com/provable-things/ethereum-examples/blob/master/solidity/random-datasource/randomExample.sol . Unfortunately I can’t understand why I am being charged .00434 eth per call (~.63$), from what I understand from the pricing it says random should be .05$ + .0$ for the Ledger proof type. Any ideas what I am doing wrong? (This is…