It needs further diagnostics.

Does it happen to have H4 bulbs?

H4 configuration has three terminals.... Low, High, and Common. Depending on the vehicle configuration, Common can be either wired as constant +12V or constant negative/chassis ground.

This is a diagram of one that has the Common connected to negative/chassis ground.


In the example above, when you apply +12V to the Low terminal, you get low beam. Applying +12V to the High terminal would give you high beam. If you give power to both Low and High, both low and high beams are lit.

All this to say that either low or high beams will light up without power applied to them. If they do, the most common issues would be:
1. Sticky relay
2. Sticky stalk switch

and much less common:
3. Current could be intermittently "leaking" from the Low terminal to the High terminal internal to the N39. This is either a defect or it may not be 100% compatible in case the vehicle uses a +12V Common. But I think everyone will agree that this is a rare issue, if not, unheard of (at least to me).