NekoInBox

Hello, I don't know where exactly to post this so I'll do it here. As the title suggests; I don't receive any more mastery for the Mote Amp. It's stuck at level 16 in mastery. I've made multiple of them and have gilded them all. Currently I have two of them still in my inventory. "Level thing" and "Mote Ampaaaaaaa". Does anybody know about this issue? Screenshots for reference; Any help or info will be appreciated.