Baked light on some objects too bright

Some objects batched lighting looks off. For eg. in this picture, all objects are created the same way, and have corresponding uv maps. Ive used generated uv maps and also created my own, but the result is the same. Every object is static, has the same material, where created with blender. If you look at the corners, you see that their brightness is off to the neigbouring walls. How can I fix this?

Also, is it normal for Unity to automatically triangulate faces or uv maps?

You may have to increase the texel resolution (in the lightiing tab) to so that the baked texture can be bigger.

Also, Unity works with triangles instead of quads (most if not all game engines do).