What does this screen look like in your VSP pump setup?
View attachment 434788
Epump1 should be set up for Filtration and that will be associated with the filter/pump function.
Your second pump should be on a different address (lets say Epump2) on address 2 and assigned “Aux pump”, not “filtration”.
You either have both settings set to Filtration, or you have the DIP switch settings in the two motors set to address 1. In the RS setup, one pump must be labeled Filtration, and the other should be set to Aux pump.
Assuming the filtration pump is Epump1 then it’s DIP switches should be set to address 1. If the Aux pump is set to Epump2 then set it’s DIP switches to address 2. The number that follows the Epump name is the corresponding address of the pump it’s controlling