Feeling more swollen and stiff is your knee telling you that you are doing too much for your stage of recovery. Either decline to do these exercises or stop going now.
Regaining our ROM does not require forceful bending or painful exercises.
Regaining our ROM is more about Time than repetitions of a list of exercises.
Time to recover.
Time for pain and swelling to settle.
Time to heal.
Our range of motion is right there all along just waiting for that to happen so it can show itself.
In the general run of things, it doesn't need to be fought for, worked hard for or worried about. It will happen. Normal activity is the key to success.