Is popping noise from my crowns something that just happens?

This likely means that your crowns have become loose.  Get to a dentist right away and have it checked out.  

This is not a normal situation. Definitely go back to your dentist to have them checked. It is possible that there is some leakage going on.

It is possible that the crown was not properly cemented or may have an air bubble. My recommendation is to go see a dentist before the situation gets worst or you end up losing the crown. 

This could mean the crowns are shifting. Go to your dentist and have them make sure the crowns aren't loose. 

Hi:This is not normal.  Probably the crowns have become loose.  It’s important to go to your dentist to evaluate the crowns and the biteBest,Dr. Maddahi

Hi Paige and thank you for your question. What you are describing is concerning to me and would encourage you to see your dentist to diagnose properly what is going on.