powerhouse generator question

[steamgas]

i just discovered something. i spread out the field coils in a flat line and applied 6 volts to the coils. then took my compass and checked the polarity on each coli and all checked north. here comes the mystery if the first test wasn't strange enough. i UN-soldered the second coil from the left one and re-soldered it 180 degrees and and checked the polarity to see if it reads south this time and to my surprise it still read north even after flipping it 180 degrees. what goes here?