Laser beam hangs and burns constantly mid engraving

I’m having this issue where laser beam randomly kind of gets hanged mid engraving and starts to burn constantly even if I stop the process from the lightburn. The machine will stop moving but laser won’t turn off.
Having an Ortur LM2 S2 with Neje 20W module and I checked the voltage of pwm and gnd wire of machine and the max. volt was 0.20(fluctuating between 0.00-0.20) when on idle, as stated by this video ORTUR LASER MASTER - Basic PWM Multimeter Test - YouTube.
Somebody please help!

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