Assioma Pedals + Spin Bike w too many Watts

I have a Sunny B1805 spin bike and installed Assioma Uno power pedals but my Watts are crazy high compared to where I was with my dumb trainer and road bike. I’ve measured my crank arm (~173mm) and made sure that Double Power is not turned on in my Assioma app. I can make up a fake crank arm length in the Assioma app (like putting it at 120mm) which gets it closer to more reasonable watts - but I got these pedals to get a better understanding of what my real power output is. Any help?