USPS early price increase?

So, when i get near my 500, i use shippo accounts to finish off the end of the cycle orders. I noticed this morning…. it was costing me 40-50 cents more a package on shipstation than usual, so i went over to shippo and it was the usual rates…  but on shipstation it was 40-50 cents higher for the same zipcode, going from the same place.  Did stamps do the usps rate a week early ?  If this is an error, will we be refunded? Will there be transparency? my 4.78 shipments are all now over $5.20+