[Closed] Garmin 800 Cadence Sensor issue

Hoping someone can help with this...

Just installed a cadence sensor on my bike which paired up fine. Went out today with the missus and it kept saying "Multiple Cadence Sensors" on the bottom of the display with only an "Ok" option, which actually seemed to do nothing as it kept reappearing every 5 secs. Now my missus has a cadence sensor on her bike so i presume mine was picking up the 2, why i dont know as her Garmin 500 only picks up hers. In the end it drove me made and had to turn of the cadence option just so i could carry on with navigation