Assuming the wiring is in proper order some other things to check for would be, first, are you testing with illuminated cars? these will bridge the isolated section until the entire train is on it. If that turns out to be the problem there are lots of "fun" ways to solve it.
A second thing that comes to mind is if the fiber pins are installed right where the incline starts or ends, it may be that the change of angel is causing the tracks to touch, letting the higher voltage flow through. Try pulling the tracks apart a bit ( 1/16 inch or so) to make sure the insulator pin is doing its job.
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