Noticed 8 to 10 burnt wires on neutral bar in panel... possible causes?

Possibly all loose screws, or broken neutral bar, something to cause all to be loose.

Assuming all is wired correctly.

Could be overloaded neutrals due to something miswired, but that would cause the entire length of wire to overheat. Effects on insulation may not be noticeable.

Or could have been one of the wires were loose and the heat caused other to overheat at the connections.

Possibly all loose screws, or broken neutral bar, something to cause all to be loose.

Assuming all is wired correctly.

Could be overloaded neutrals due to something miswired, but that would cause the entire length of wire to overheat. Effects on insulation may not be noticeable.

Or could have been one of the wires were loose and the heat caused other to overheat at the connections.