Fenix 5X Plus keeps connecting to a spd/cad sensor instead of Scosche Rhythm 24?

When I start an activity (CrossFit I created) and use my Scosche Rhythm 24 it always shows it's connected to a spd/cad sensor that I don't have? What's going on? I go into settings and the SR24 is connected but it doesn't seem to be the sensor my watch is using? When I do this activity there is no HR measured. I'm confused. Any help is appreciated.