Normal Map displaying weirdly

The way I made this normal map was I actually had individual meshes (that were already baked on their own as individual meshes) which I made into a modular set which I then used to build houses out of. Then I unwrapped all the individual meshes into a single separate uv, which i then baked the texture maps as diffuse using the previous textures as the “base colour” input

by bake settings, are you referring to like using Cycles?
and by file format are you referring to it being a PNG?

oops, where should I have posted it under? Thanks!