how to reduice this blue tint

Do you have polygons in that places? Flipped normals? It is appear after baking light? Please, describe your problem

There is no problem with polygons and flipped normal, the blue tint is appearing after baking.

Do you have overlapping polygons on lightmap? send a screenshot

screenshot is attached in below comment there is no overlapping on lightmap

This is the screenshot of lightmap

This is screenshot of lightmap

there is no cube map.
??

How is the cube map in the Skylight if any?