Magene Sensor (Help)

Hi guys, I recently bought a cadence sensor because my Direct Drive Trainer doesn’t have this sensor, so I was able to detect the sensor and start my bike ride (I even downloaded the Magene APP and it didn’t ask for any updates, although it detected the sensor and worked perfectly), although while I’m using the sensor it oscillates too much, for example, from 60 to 75 rpm in a matter of seconds and during the whole race, even though I’m at a constant pace, could someone help me?

(Magene Sensor S3+)