Gentlemen,
I assume your chairs are Flexsteel units and the back recline function is mechanical. If so, either the handle to shaft attachment is faulty (broken or loose) or the mechanism or back itself is jammed. If jammed, you may be able to get it to function again by moving the back back and forth as much as possible with one hand while working the lever with the other hand, If no joy, you will probably need to remove the chair so you can access the mechanism to see where it is jammed. There is quite a bit of info on the web by searching Flexsteel troubleshooting, etc
Steve