So I used the lighting tab to try and make the game lighting realistic. After I was done, I saw that other parts in the game, like the one below, began to glow, which ruins everything in the game. How can I fix it?
That will be the bloom effect which appears on bright surfaces. If you disable or reduce the bloom it should be corrected. Alternatively you could darken the lighting or the color of the parts. Anything to make the parts appear less bright should help with the bloom effect. Or, again, just disable the bloom.