You have a recipe tree that currently makes no sense:

Cactus > [Shapeless Crafting] > Cactus Paste > [Smelt] > Cactus Green

Where Cactus still smelts to Cactus Green anyway.

The paste makes sense when mixing 4 Tiny Cactus together, just not for the normal Cactus.

I only noticed this as Plugins for Forestry now has a shapeless recipe for Cactus which actually goes somewhere :)

This was to allow you to get cactus paste from cactus (it will have a use)

I'll have to change it to be compatible with Forestry

Thanks, @denoflionsx !

It is actually a PfF recipe. I can change the recipe to shaped to resolve the conflict.