Hi, thanks for writing to HCM.
Based on the description , I suspect PERONEAL TENDON SUBLUXATION as the cause of your symptoms (feeling of pop without pain, and only warmth).
A detailed physical examination is essential to diagnose this condition and an MRI
scan of the ankle joint is necessary to rule out other pathologies in the ankle joint.
Consult an orthopedic surgeon for a detailed workup and further management.
Hope this information is helpful. Good day