Bypassed Ballast Resistor?

The jumper was likely placed there because some one though the ballast was bad or some one said it's not necessary.

I have never heard that a coil shouldn't be mounted horizontally and it certainly does not pass my sniff test as something legitimate. Yes they are oil filled but unless it's leaking orientation isn't going to make a difference especially since as often as not they come from the factory mounted horizontally.