Grandmaster armor of the Griffin school (The Witcher 3: Wild Hunt)

Hi all. There was a problem, a bug or xs how to call it.
After completing the quest from Lafargue, I made a complete grandmaster set of the Griffin school, but it turned out that it was very poorly pumped (trousers 91, gloves 87, boots 91 and armor 240, I generally keep quiet about swords).
Googling, I saw that this armor should be 2 times higher (armor 390, pants 151, gloves 147, boots 151).

I haven't been able to find a definitive answer to this on the internet. What to do with it?)) How can you improve a fucking set?)