Hi @Jeff_Ling and welcome to Zwift.
Spin bikes are known to have accuracy problems when it comes to power readings. If you want to race you should have a more accurate power source such as power meter pedals or a smart trainer. For around the same price you can get a Kickr Core or Elite Suito assuming you have a bike to hook up to a trainer. If not, find a cheap used road bike, or power meters are as low as $299 now but make sure they would be compatible with the spin bike.
This thread might help too:
I would suggest you get a smart trainer. The experience will be better, more fun and that means your fitness will improve faster.