Strange feeling when stretching and bending right elbow – Worrying?

Good evening,

For the past two months, I've been experiencing a strange and uncomfortable sensation in my right elbow. As soon as I fully bend it and then quickly move it slightly away from my bicep, something cracks in the yellow-marked area (photo). After I fully straighten my arm again, it tingles there and hurts slightly. The pain might be radiating slightly toward my wrist.

This is not the case on the left side.

I also occasionally do strength training (push-ups, hammer curls, etc.), which increases this by about 230%. The next day, it's gone again. But even without two weeks of strength training, I notice it, albeit to a lesser extent. Warming up and proper form don't make a difference.

What could this be❓

Thank you very much! M17