NID as a contextual filter doesn't work on some nodes I have a view where the NID is getting passed as a contextual filter for a specific content type, but some nodes doesn't pass at all and for some of them there is no problem. 

I've checked the database, and I can see that the node NID I am trying to expose is there, but I still can't see it in Preview with contextual filters.
Finally I configured what was the problem. There were two referenced fields related with Relationship in view, and for those two relations I have checked the box "Require this relationship". So whenever I created content without any of those fields, content view was empty. When I unchecked  "Require this relationship" boxes, everything works good.
How ever thanks for your effords to help me.