I'm not sure what is causing this but have a feeling it is simple. My armature rig is fine in Edit mode, but changing to Object or Pose mode flicks and sticks the right leg to the left. Anyone know what may cause this?
Go into pose mode. Press "A" a couple times until your entire armature is selected. Press Alt+G, Alt+S, and Alt+R until the bones are back where they belong.
Fixed it. I forgot to duplicate and copy the IK bone I had set hidden.