I succeeded to fight moobs(man boobs) via standard push ups suddenly when im working out my lower pecks by incline push ups and finished the routine I saw my other chest is more bigger(left) than the other one(right) I wonder why?? I always check my posture and balance before going to do push ups im a left handed person

I succeeded in fighting a saggy male chest via standard push ups. When I was working out my lower pecs by incline push ups and finished the routine, I saw the left side of my chest is bigger than the right side, and I wondered why? I always check my posture and balance before going to do push ups, although I am a left handed person.