Bingo (I think) - those little triangles with the bar in front are symbols for diodes, and with a circle around it is an LED. So it does have a single indicator light, right? The four diodes arranged at the indicator lamp allow the signal current to pass through the indicator & to the bulbs through one pair or the other depending on which side is switched on - you can trace it by the direction of the arrows. The 'opposite' pair of LED's acts to block the flow of current to the un-switched signal side - but they aren't completely blocking & allowing enough voltage through to dimly light the opp. side.
Increasing the inline resistors @ the signals should take care of it, I think.
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