I made a purple stained glass wall but in a certain area about 5 of the blocks are grey and about 7 of the blocks are red. I knocked them out and replaced them and still the exact colors in the exact positions. When I knock the blocks out they say "purple glass wall." What is going on? I initially had a stone wall there and I tried to paint it pink and the pink did not show up on the black surface so I knocked it all out. Help!