Hello,
Are you talking about employees are having wrong worker position assignment? If so, please refer to the following:
Open the employee record, click worker position assignment.

Then click As of date, turn on Display all records and apply. Click the position you want to delete.

Then click Changes timeline and select Manage changes.

Go to Position worker assignments tab, remove this record.

After that if you go back to that employee, the worker position assignment record will be gone.
Hope this helps.
Regards,