Ok, it sounds like you have a bad fitting cartridge in the group, there may be more then one, so to determine which it is please do the following:
Remove ALL 9 Inkjetmall Carts, install ALL 9 OEM carts that are currently in the other printer. You are going to want to trick your Cartridge door sensor with a thick/folded piece of paper to get the printer to think the cover is closed. Once you have the cover sensor tricked and all 9 OEM carts installed, you are going to want to take one out at a time, starting on the one side or the other and install the refillable cart, 1 at a time until you see the no cartridge recognized symbol again. This will indicate which cart is ill fitting, at which time you can start to diagnose how to repair the cart to fit properly. Push the cart in, if this makes the printer recognize then affix a layer (or 2 or 3) to the top of the cartridge at the indentation directly behind the control chip area, this will allow the cartridge a nice snug fit into the printer so the chip read sensor can read the chip properly. If pushing in doesn't work, try to push the cartridge UP/DOWN from the bottom, if this gets a recognition then apply 1-6 layers of masking tape to the bottom of the cartridge until the chip read gives you a recognition.
This is a matter of "plug n play", you are fortunate to have OEM carts on hand for this procedure, it will make the diagnosing that much faster.
Keep in mind, when you have the OEM carts installed and they are being recognized, the printer is going to want to run through a start up, DON'T allow this to happen, otherwise you will risk introducing color ink into your K7 system. Instead, quickly pop out the cartridge to be tested and install the refill cart then proceed.
Let me know your results,