Industrial Electrician, Class A
This is what they are designed to catch?
Op's header said combination so I'm guessing no gfci protection. Unless it was either one of the breakers that has undeclared gfci in itYep, looks like overheating to me.
DFCI breakers are designed to catch both, Ground Faults & Arc Faults from what I understand...not to mention overcurrent.
So...protect wire (overcurrent), protect people (ground fault), & protection against fires (arc fault)