Vortek system purging unnecessarily - User error?

Hi,

I suspect that is an issue on my end but would love some clarification from more experienced users. I am owning the H2C for about a week and one thing seems odd to me. Very often the Vortek system works exactly as expected but occasionally it reuses the same nozzle for two colours although there is availability.

In this case I sent a printjob from my mobile (3 colours) and defined all the colors / materials to the right hotend. I would now expect that the system uses 3 nozzles to print this.

In my case it used one nozzle for one colour and 1 nozzle for the other two colours, purging a lot (obviously) in between while 2 0.4mm where hanging on the rack (light on and visible in Bambu Studio).

Why would the printer do this? Might that be because I printed another material on the other nozzle(s) before? Have I somehow excluded the nozzles from use (involuntarily)?

Thank you!

I suppose it might be connected to some kind of issue due to sending the job from the mobile. When I look at the current stats of the print it shows filament usage of 66g whereas the usage is 61g when I send the job from a computer.