@AJS914 I’ve been taking a lot of data on Stages single sided power meters lately…and orthogonal strain gauge array power meters in general. I was going to publish the data but as I got ready to I balked. It was really a recipe for how to cheat on Zwift and that activity is already so endimic I didn’t want to contribute. And this would have contributed in a big way!
I think Stages temp compensation is pretty good over a commercial range of temperatures. But maybe not as robust as some people might think. The difference you notice is QUITE LARGE. Yikes! So maybe there is some hardware issue with your power meter.
According to my cal factor/watts curve that difference would result in 10’s of watts difference between the two readings.