So I was playing Starmade, and decided to make a space station to dock all my ships at, so I pressed "Z" (by default its "M" but I changed it so it was next to the ship core-placing button) while holding some white hull, because I thought it would place the white hull. Instead, it place a grey hull, but it didn't even use any of the grey hull in my inventory! I still had the same amount. Then I destroyed it to try again, to see if it would still happen. When I destroyed the grey hull, it gave me TWO grey hull in return!