I have this skeleton for a cow :
With this property for both IK bones :
The problem that I have is that when moving the front leg, the bone directly connected to my bone with IK constraints will not rotate. The angle will stay exactly the same. If I increase the chain length, then they will all be stiff joints, only the last joint will rotate. You can see what I mean in this video. The backleg works perfectly fine. I already deleted it all and restarted but I have the same issue.