gear issue?

Hello, Yesterday I was playing on my AST (lvl 71) and was wearing a full set of Augmented Scaeven Gear at Ilvl 400. This included all acc and weapon. All of it had materia in all slots. I was using the gear to finish lvling AST (last job to get to 80 before cap increase), and going to use it to lvl Sage. I log in this morning, get the quest to unlock sage, and noticed that my gear for this is messed up. Suddenly, everything has no materia, and is dropped down to the standard Scaeven gear (Ilvl 390) except for 1 ring and the pants (both still missing the materia though). Why did this happen? I dont see anything in the patch notes saying some gear will suddenly drop quality, forcing you to rebuy it and lose your mats. How can I fix this, outside of rebuying everythig? Is it a bug or is just what SE decided to do for the hell of it?