Cannot assign "Learn MIDI CC# Automation"

I have an MPD226 that I like to use for the 4 faders and knobs for controlling my VST’s.

I want to assign the four faders to the four FX sliders in SIGNAL (by Output). But once I assign one and go to the next, the fader on the MPD controls all of them at once (see vid)

Anyone else have this problem and a solution for it?