Changing the roughness texture node's colour space to 'non-color' fixes the shininess issue, as well as the normal map! - As pointed out by "+-BONELESS-+" in the comments!
This is an overview of the workflow I use for my game Astrodition:
Steam Page: https://store.steampowered.com/app/1159940/Astrodition/
Website: https://astrodition.wordpress.com/
Instagram: https://www.instagram.com/astrodition/
Twitter: https://twitter.com/astrodition
Reddit: https://www.reddit.com/r/Astrodition/
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My Blender, Quixel Mixer, Unity3D Workflow | NatokHD