Square taper yes.

I do have some taught ring bolts, and I lost my chain ring tool to hold the back side so I can 'crank' them down.
I took crank arm out thinking there may be play on the BB, but did not see any. Pedals are about 10 months old but you never know.
I can try my older pedals, and I think I have another chain ring as well. Hrmm, I still have the OEM BB, so won't hurt to replace all that I can and see what comes up.

This every other pedal stroke is a bit confusing.

Thanks for info!