I have a carbon film resistor that got so hot that it melted itself
free of the circuit board. Can the resistance (of the resistor) be
permanently increased when this happens or does a resistor just become
"open" when that happens? The reason I ask is because I have two
resistors in parallel that go:

Black | Brown | Black | Gold

I think the resistance should measure ~1/2 Ohm, but my ohm meter reads
33 Ohms. Does this mean they are damage or did I do something wrong?

Thanks,
Scott, KC2PIH