Good afternoon, Svetlana!
Each store has its own terms for crediting cashback to the balance, which are needed to transmit information on orders. For O'STIN, the maximum latency is 75 days.
A downward change in the amount could occur if promotional codes were used in orders. We see you have created an appeal. To understand in more detail, we passed the request to partners in it.
The manager will contact you as soon as a response is received.
Respectfully,
LetyShops team