Somehow turned on Tap on a pin pad?

Okay so one day I was on self check and one of the machines had their pin pad disconnect. So I rebooted it and thought it was working when I saw a customer using it but it wasn’t so I had to reboot it again. This time I checked to see if it wasn’t getting stuck on the Total screen on the pin pad. To my complete surprise the light to beside the keypad turned on and Tap was available. Me and my coworker tried it but it said it couldn’t read our cards. I’m wondering if anyone had this same experience.