I would put some more ammo through it and if it continues would consider it a problem. I usually put over 1000 rds a month through several different model pistols. Not one ejects brass to my face. It's your gun so it's not a problem if it doesn't bother you though. Good luck with it.
the semi-auto handguns I have ownd and fired have taught me a few things. never wear a shirt with a collar, always wear eye protection and if shooting from the hip wear long sleve shirts. If you can't figure out why then live and learn. Brass burns my friend as quick as it hits you. Be safe and remember in a true self defense situation it don't mean nothin.