Upon right clicking the salt item, only two out of the three recipes show up with the shapeless salting recipe missing. This also occurs when it's just REI and Salt by themselves.

JEI shows the recipe just fine as shown below:

Sorry if this isn't your fault as I'm unsure who's at fault for this issue as the JEI plugin compatibilities mod for REI seems to work just fine with no errors

Closing issue. It is most likely on REIPC's end according to shedaniel.