Hey c0cllc,
In order to effectively assist you, I am going to need some way to reproduce this issue on my end. With that said, you are more than likely coming across the change made to our roughness values between 4.13 and 4.14. I answered a similar question for another user who was reporting a problem with the visible differences between the two versions.
Take a look over my answer and let me know if you have additional questions.
Thank you,