Ok what your screen shots show is it all working as expected… there is no relationship from the physical side spool to the system, you just have not assigned any filament types to the side spool.
How the K2 operates, is if the external side spool is selected, then the K2 does not feed from the CFS, but only uses the filament detector inside the extruder to detect if there is filament or not.
So when its saying side spool detected, without any filament loaded from the CFS, this means the extruder is detecting filament, either broken off, or something is activating the filament detection spring… this is located withing the extruder, as part of the extruder front cover you remove to clear jams.
My guess is one of 4 problems…
- Broken filament / jam
- your extruder front cover bowen connector is failing and the ptfe tube is triggering the “filament is loaded”
- The filament detection circuit board inside the extruder front cover is faulty
- You have suffered a front cover extruder spring issue (whice ive documented on this forum)