I remember the related product css that was added was for the fix for the setting because it’s showing lots of products in it. This was long ago. Don’t remember exactly but it was there for a reason.
Cleared cache on both Firefox and Chrome. https://prnt.sc/aVlH4b9EEZPO
The related products is showing 50 products on single product page.
Didn’t fixed it. Can you check it again please?