As per protocol for rehabilitation, you are on track. We need to evaluate where the clicking noise is originating from and that would depend a lot on the implant used for fixation, the type of fracture originally and the current situation of fracture union.
For these recent and previous xrays are needed.
Also your ankle range of motion needs to be evaluated.
Pain is common during weight bearing and range of motion exercises after such surgery as there is associated stiffness. Pain will reduce as the range increases and bone achieves union.
Next Steps
Recent and previous xrays. Clinical evaluation to pin point source of click.