The video has a stackable cable from Marbles X2 to Plaits V/Oct, and then a normal cable from Plaits V/Oct to Rings V/Oct.
In VCV, all output parts are inherently stackable. The equivalent VCV patch is two cables coming from Marbles X2, one going to Plaits V/Oct, and the other to Rings V/Oct.
There are some differences/bugs in the Rack implementation that make it slightly different from the hardware/software from Mutable. Don’t know if you’re running into those & honestly I can’t remember what they are.