I have displaced tIles depending of the game resolution

So im trying to make a game with tiles in unity 2019.4.10f1, and all sems to be good when i made the palet, adjusted the tiles, and drawed the tile map. But in the game view, the tiles are lightly displaced and there are blue spaces between some of them. It depends of the game resolution, and i dont know what to do to set it correctly

Thank you and sorry for bad english.

maybe it is because there is no background image?