The biggest issue facing this warehouse is the site director. Multiple employees have left because of his leadership, and morale continues to suffer because of it.
There have been multiple HR complaints and employee concerns raised regarding his conduct for a while, yet many employees feel that little to nothing has changed. That lack of accountability has created a culture where people stop believing their concerns matter.
There are ongoing concerns about favoritism that have been discussed by employees for a long time. Employees notice when certain people appear to receive different treatment, different standards, or exceptions that others would never receive. Employees notice when concerns are raised repeatedly and nothing changes.
The result is exactly what you would expect. people become frustrated, trust in leadership declines, and eventually people leave.
The warehouse has good employees and good managers, but until the site director is held accountable for the culture he has created, the same problems will continue.