I'll ask them before about this when I deposit the next time. Also, the last time it happened. The service I sent the funds to asks you to enter the transaction ID in the field to show that you have made the payment.
sadly there still are some bad services that follow the transaction ID instead of only watching the fresh and unique address they've generated for the customer, which should be the case everywhere. it is not that hard to change either which makes you wonder why they are not doing it after all this time!