Ok so I figured out it’s jumping channels Bc my MIDI wasn’t configured to output to track channels - it was on auto.
Love to know if there is a way to midi control the fx bus and assign multiple parameters from multiple tracks to a single pc4 knob!
Is your Syntakt updated to 1.0.1? CC for FX bus was broken in 1.0.
You can check out my presets for controlling the Syntakt with the PC4 and the pdf that describes configuration in this thread.
The PC4 can only send one CC per knob, if you want to change that, you need to route it through something like the Blokas Midihub.
Someone doing this with an EC4
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That one might be a better option 
The Fx bus is channel 13 actually
I’ve been using an OG Beatstep with my digis. but the endless encoders drive me nuts. Just order a PC4 because of the fixed pots, and for the fact that there’s 24 in of them. So I’m going to play with this and the Syntakt for a while, looks like great fun!