Hello, Lately Everytime I Bend Over And When I Go

Hello, lately everytime I bend over and when I go to stand back up my rib cage feels like it's stuck inside itself or something. I stand up slowly and have to literally push my ribs back into place it seems. Mostly discomfort rather than pain. Feels as if my rib cage will snap in half if I came up too fast.

Had gallbladder removed 2 years ago. And had heart surgery a year and a half ago. Could you please tell me what this feeling could be from ?