2019 Honda cb300r occasionally has popping when engine braking

It has an SC project slip on exhaust but I'm not sure if it's a real one(previous owner had it installed). Sometimes when I start engine braking my exhaust pops once or twice. I thought that was normal but seeing online that it's bad for the engine? Usually it happens when I ease up on the throttle but not fully cut off the gas. Is this a big problem for the bike? Will it be okay if I just stop engine braking? Or is there an issue already that needs addressing?