Why are some of my sprites brighter than others?

Hello. I’m making a 2D top-down game. I just recently found the ability to add lighting to sprites (Add a material and set it to Sprites/Diffuse) and I have come across an issue. Though at the same z position (give or take a hundredth of a unit), some sprites amplify the lighting more than others as if they were closer to the source! This can be seen by my player being a lot brighter than the background:

Is there something I’ve set incorrectly? Is it a coloring issue? Thank you in advance!

It would seem I have discovered the issue. I had unknowingly set my player’s z scale to 5, and left it as it visibly does nothing in the 2D environment. What I did not know is that the higher the z scale, the more the lighting becomes amplified. Once both scales were set to 1, the problem was fixed! I hope my blunder is helpful for others who make a similar mistake.