air in returns

My pool is blowing air from one jet but not the other. Water level is fine and no air at pump, I am really confused?

I am new to this forum and have enjoyed reading a number of threads about air bubbles in return jets. But, thought I would contribute my situation and see whether there is need for concern. After many years of single speed pump usage, I made the transition to the Pentair Intelliflo2 VSF. The...