A quick search shows cartridges for a D92 available on ebay at less than £6 for 10 (2 sets + 2 spare black) – double capacity.
I regularly purchase compatible cartridges for my Epson inkjet – I always ensure that they are claimed to be double capacity, having twice the ink of genuine Epson cartridges.
This may be the reason for the monitoring software still showing full cartridges, but it is more likely that the printer cannot determine the ink level (of the compatible cartridges).
I have experienced this problem on some compatible cartridges – such that the printer continues printing with an empty cartridge. Once the cartridge is replaced, all is well once more.
Not having an indication of remaining cartridge ink, is a small price to pay for the gain in money saved.
Given the cost savings of compatible cartridges versus the genuine article, my recommendation is use them from day one – if you need to make a claim on the product guarantee, stick the originals back in.