nothing is wrong. All the sensor does is know the location of the crank from the (i don't know what it is called) thing on the crank. The only thing that can mess this up is to remove this part from the crank and put it back wrong. But it only goes on one way, you'd have to severly beat it with a hammer to put it on wrong. The sensor just picks up the pulse from that unknown named part. You're ok. Just to ease your mind, I just rebuilt my entire engine and just bolted the sensor back on and everything has run just fine.
Ride hard today, Ride harder tomorrow,!
Walk close to Christ today, Walk closer tomorrow