If you have changed activity scores in the Blackboard gradebook, your changes might be overwritten by manually syncing scores from WebAssign. To prevent this, edit WebAssign scores in the WebAssign gradebook.
Sync Scores to Blackboard
After adding activity links from Blackboard, your students' WebAssign scores sync to Blackboard based on your settings. If needed, you can manually sync scores to Blackboard.
How-ToInstructor HelpWebAssign