Thanks for the reply guys. I figured out the problem. We are using multicraft, so the config that was actually in use was generated in a different location (in the "jar" folder) than it would be otherwise.
We are trying to get a private server set up and we keep finding two type of copper and tin ore..
Copper (140:5 & 249)
Tin (140:4 & 248)
It is quite annoying having two of the same ores that won't stack. Does anyone know a solution? In the redpower.cfg the copper and tin under generation "=0" yet there are two still generating.