The EBC brake pads weren't good after all

I replaced my rear tire, and noticed when I removed the rim from the swing arm, one brake pad fell off from the caliper. Actually, the asbestos block separated from the metal plate. That is odd. There was like 4mm asbestos left, how come this came off the plate? Not cool, now I have to order new brake pads. Maybe temporarily I can glue that pad on myself on the plate. Not sure what glue could work though.