ATM10
silent-gear.1.21.1
neoforge-4.0.25

Silent Gear Parts keep down grading in the grader, Uru bow_limbs had two Max and one SS, after grading it had all three SS.

LobsterJonn said that needs to be reported to Silent Gear.

Won't load up Video of grading in here

It also affects the Paxel heads with Uru metal. I crafted three heads because I wanted to make three Paxels for myself and my two teammates. I was able to upgrade one Paxel head to 5x MAX without any problems. The other two didn't work. I already had one at MAX-SS-A-SS-S. On the next run, it reached grade A. After that, the grade was SS-A-A-A-A. Very frustrating and a costly waste of material.
Fortunately, the katanas (Uru metal) didn't cause any problems.
But there were also problems with the Bow Limbs. Also Uru metal. Bow limbs one and two were no problem. The third Bow Limb had the same problem as with the Paxel heads. I then crafted two more Bow Limbs to test. These two also kept downgrading. Impossible to get them to full MAX.
We are playing ATM10 and have the latest update.