the order change its status in wrong way

i want to solve this issue :
i have a website that use ubercart to make payment.
when the user buy a product by ubercart by the 2checkout.com payment method the order status changed automatically immediatly like this -->

Order status changed from In checkout to Pending.

Order status changed from Pending to Payment received.

Order status changed from Payment received to Completed.

Order status changed from In checkout to Pending.

then the user granted to download the files of the product
but the correct case that the order status should changed to "pending" then when the payment recieved the order status become "payment recieved" and the user granted to download the files of the product
the user must take grant to download the files when only the order status changed to "payment recieved"
how can i solve this issue i look at the log of the order
the order change its status in wrong way
why the order change its status like this??

this make the files granted to download

please help me please please

and i want the order status to come to payment recieved only manually not automatically
how can i do this