My dev teams move stories to "In Review" once the development is completed and assign it to the PO for review. The issue is most of the time the PO does not complete the review before the end of the sprint .
This causes 2 issues
1) Work done by the dev team has no credit as the task is not "Done" . So when we review the velocity, there is always a wrong data
2) These tickets which are" In Review" by the PO move to the next sprint and give an impression that the next Sprint is loaded.
How do you manage such cases?