What about any clear front, back and side pics!?
I take it you are rt handed?
Do you ever do DB or single arm/limb work?
Does your left side drag behind the rt at all on say bar presses etc.?
What is your age?
How long have you been training?
I had a few discrepancies when I started out, with some rt shoulder droop. Over time and some balanced work whilst paying attention to all the facets of flexibility and "even pushing" from both sides etc. etc. it is quite fine now.
At times when people first start training, one side is stronger from activities they were used to doing, like throwing, kicking etc. with their dominant side. Eventually thru more balanced training one side does not gewt used more and I think this can even out moreso.