So this is strange but i found these guys on a belt where they shouldnt be.
10-28-2024, 18-03-45.png (576.68 KiB) Viewed 189 times
The only place where copper plates come from is here
10-28-2024, 18-07-29.png (645.75 KiB) Viewed 189 times
Ive seen this ~10 times with different items. Not sure how to reproduce it bcuz it looks random. Not sure if this is a splitters+manipulators filters fail or save-load problem but once every 3-4 hours i see my belts are full of lower quality items.
Probably found the problem. Even distribution's Shift+C doesnt respect quality at all. If chest contains uncommon plates then it drops any quality plates into it