Are the grounds and neutrals in this electrical subpanel reversed?
Whoever wired this panel simply was not paying attention

The installer who wired this panel did not pay attention to the schematic on the label, assuming that removing the bonding strap was enough here.  However, the split ground design of these Murray panels means that the left-hand bar is factory bonded to the case, with the right-hand bar being the only neutral bar, when the bonding strap is detached from the neutral bar.

Sadly, the only fix for this is to move all the neutrals over to the right-hand bar and move all the grounds over to the left-hand bar, pigtailing extra wire onto them as needed, as the bonding screw on the left-hand bar on these panels is factory-fitted and not intended to be removed in the field.