Site injection...VERY strange problem

SO I'm new to the game and I've heard people say "site injections work/they don't blah blah". Well I do my glutes, and I am left handed so I usually do left glute as its really easy. I've done like 6 shots in left and 3 in right. MY LEFT ASS CHEEK is bigger then my right? WTF? anyone else experience this? And I don't have an infection I went to my doctor and told him I was shooting b12. Needless to say, I'm gonna start shooting my right side more often no matter how muchof a pain it is. Sorry if I am freaking out, but I can feel my ass and feel my other ass cheek is bigger with more muscle, btw its test e, 2 cc's a week.

It's not muscle but the oil and or swelling that is causing this , you'll be fine just try to keep it even in the future.