Soreness in the joint is still normal at this point. It can take months more before the joint becomes free of soreness or stiffness, though it should become less as you go forward. We all get a few clicks, clunks, grinds, or other sounds/sensations. New movements, especially, are likely to bring them on. Most don’t stick around for very long, but a few might continue.
Hips might act up due to the new joint causing changes in gait or leg alignment. Often the pain will go away as the body adjusts. Sometimes, though, the hip already had a problem that was “masked” by the bad knee, which hurt more and commanded attention. In those cases, after surgery the hip starts to command attention to its problem. If the problem persists, it might be time to visit your OS and find out about your hip.