I first noticed this on a Reddit post. Non-waxed chiselled copper is correctly ordered, but waxed chiselled copper is not.

The order goes like this for the non-waxed blocks:

• Chiselled Copper
• Exposed Chiselled Copper
• Weathered Chiselled Copper
• Oxidized Chiselled Copper

For the waxed variants, it goes like this:

• Chiselled Copper
• Exposed Chiselled Copper
• Oxidized Chiselled Copper
• Weathered Chiselled Copper