Pin #1 might have been bent to solve a reset issue that occurs with some drives on the Amiga, but it's possible that it got caught and bent by the plug when it was connected further down that it should've been. Also be very careful you connect the cable properly to the motherboard - as there's no surround on the connector, it's very easy to connect it to one row of pins, leaving 22 pins unconnected. This can do all sorts of strange things to the drive, and may damage it if you're unlucky as some pins are for power and can be dangerous if connected to the wrong pins on the drive.
