Those figures are supposed to show how many of the item you can make, I believe the fault you have pointed out is because of the systems inability to differentiate between your characters inventory, and yoru cargo hold inventory :S
Additionally the intensity of the colour indicates how much of a boost the item will give the crafting skill when made:
- grey ( + 0 pt )
- green ( + 1 pt per 2 items made )
- yellow ( + 1 pt per item made )
- orange ( +2 pt pre item made ) ~VMT to sarge-smith, and mufasa for this information~
It might be worth popping into the devtracker forum and letting them know about this.