This is related to #2.
After the issue about the edit not being reflected in all objects, I went on to delete said customer whose editing caused the bugs.
Becaue the edit was not reflected in the order list, when the customer associated with the order was deleted, said order was also not deleted, resulting in me having orders that have no corresponding customer object in the customer list.
In the screenshot, the customer that was once mary lee has been deleted, and there is no mary lee customer in the customer list
This is related to #2. After the issue about the edit not being reflected in all objects, I went on to delete said customer whose editing caused the bugs. Becaue the edit was not reflected in the order list, when the customer associated with the order was deleted, said order was also not deleted, resulting in me having orders that have no corresponding customer object in the customer list.
In the screenshot, the customer that was once mary lee has been deleted, and there is no mary lee customer in the customer list