I have been doing Incline DB Bench Presses lately. The last few times I have had a popping in my shoulder, I think it's the lower part of the deltoid. It happens as I bring the weights down to my chest and I am almost to the bottom of my range. It feels like something is binding up and kind of pops free. It does not hurt, both sides do it a little, one more so than the other. It doesn't happen on every rep and it doesn't happen with anything else like flat bench or seated shoulder presses. Is this something I should be worried about and stop doing the lift where I experience this?