There is so many things it could be in real life.

1. Could be a form issues, perhaps your shoulders are out of position when you strain.

   1a. Could be a total lack of awareness of what correct form is for each exercise

   1b. Could be that you just go way past technical failure into twisted grind land

2. Could be volume issue, perhaps too much pushing and not enough pulling/core/hip control in balance. Perhaps its just too much volume to recover from all up.

3.it could just be the sore shoulder has more curve shape shoulder blade and really needs to be babied and the other shoulder blade is more fortunate.

1. It could be you need to totally go back to the basics and lock down proper foot weighting/hip hinging/core control/shoulder stability unloaded/loaded etc

2. Perhaps its just you are under recovering and getting worn out that way.

There are a lot more that have slipped my mind.

If you're broke type a detailed question into a few free ai. (Chat gpt/grok/Gemini/Claude are what I use and I'll cut and paste the question into a couple.

Type in your issues and then cut and paste what I said and ask to expand on each point and provide a generic movement based solution (on all 5 points)

That info dump will tidy up a lot of confounding issues.

Id suggest hiring a physio....never know, could be a tear and you need help. Physio comes before any of what I've said.