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tmel wrote

I the other box has red/black/white and black white wire) but what is neutral in other boxes (white twisted together with white) that one is white twisted with black.

 

@tmel If a white is connected to a black wire, it is almost certainly not a Neutral, but a Traveler.

Any white wire that is connected to the actual switch MUST be a Traveler and NOT an actual Neutral - in a Light Switch box, Neutrals are never connected to a switch (other than the Neutral connector on a Smart Switch).

So it appears from your decription you possibly have a mistaken white wire identication. 

A good way to identify if a white wire is a traveler or a true neutral is to follow back to where it breaks out of the Romex - a three conductor wire that is black, red and white will have that white conductor be a Traveler; whereas a 2-conductor wire that is just black and white would be either the line in or the load out (depending on which box) plus the neutral for each