I'm not new to bodybuilding at all. I know a great deal about shoulder health. However, this is beyond my best knowledge (and that of the doctor/all their fancy technology).
I have a pop/click in my left shoulder. It's loud and can be heard when I tug my shoulder in towards my chest and do an internal rotation. It sometimes pops twice and clicks and cracks. The shoulder also feels loose, as if it is not attached to my body. It feels unstable when I do dumbbell presses, and if I go too heavy it wants to give out. My right side is my strong side and it feels like the arm is attached and my body wants to lift it. My right pec is thus bigger than my left, right shoulder and bicep bigger then my left. My left side just feels weak, in fact. But I can't seem to get any muscle to build without some sort of pain in my elbow joint and shoulder.
I have had no muscle gains on my left shoulder since it was "injured" sometime in 2014 or 2015. I think I may have dislocated it or pulled a muscle, but I don't know. I am not sure if anyone has experienced weird popping and clicking.
My issue is this: I've had an MRI, x-ray, and ultrasound all done in the last year and they have found no tears, not even tendonitis. So I am absolutely baffled as to what is going on.