We have to understand olms law here! If that one magnet was shorted out with very low resistance most of the current would go to ground at that brake with hardly any at the other three.
Let's say three magnets are at 4 olms each and one at 1 olm. Current takes the path of least resistance with most going to the 1 olm one.
I would be checking the resistance of each magnet when you take it apart to solve the mystery. Keep track of each magnets wheel position. Measure wire to wire and each wire to metal body of the magnets. Build a little chart and see what you read with the meter.
Everyone should have a good multi meter and learn how to use it. Chris
