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I suspect the problem might be the possibility that the two track controllers are from the same power source and thus may have a common; if so, the crossovers' difference is that the common rail is a different side. To test, if one controller is disconnected completely, does the problem go away?
 

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The simplest and potentially total solution would be to use a separate power source for each controller. The issue you raise about the indicator might be a fault or it might just be the controllers interacting. Do the indicators work as expected if the controllers are disconnected from the track?
 

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It is neither the points, nor the controllers at fault, which are performing as designed: but the limitations of the set track system, which is intended for children to run a train with a controller per track circuit.

The moment you put a crossover across two independently powered track circuits without modifying the points and paying attention to track power wiring, problems of the kind you describe emerge. There's no short cut, you have to understand what to do based on the 'why' of it, and a major help is a good book such as this:

There are now much better options readily available, flexible track systems from the likes of Peco of superior design to deal with connecting track circuits, and DCC control whereby you can drive all the traction from a single controller. Happy New Year!
Not sure that set track is the issue if it has insulfrogs which the quoted points have. If the controllers disconnect track supply when neutral then all should be fine when transferring between tracks but accepting that both tracks will be live to the controller in play.
 

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Not sure that set track is the issue if it has insulfrogs which the quoted points have. If the controllers disconnect track supply when neutral then all should be fine when transferring between tracks but accepting that both tracks will be live to the controller in play.
 
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