Remember that the human body is not put together to exact engineering specifications. Bits won't fit together perfectly, so as they move against each-other you get cracks and pops. Does this matter? Well, any physical issue must be addressed with two questions.
- does it cause pain?
- does it hinder you from doing something you want to do?
If the answer to either of these is "yes", see a doctor, physio, etc. If the answer to both is "no", then forget about it.
Mine have popped for years. In my case, it's patellar maltracking. My patellar maltracking does not cause pain or hinder squatting, etc, but it does hinder running, cycling or hiking long distances. Since I want to squat but do not want to run long distances, it's not a problem. If I decided to run a marathon, I'd have to seek medical help first, not merely psychiatric but for my knees.