I looked back and you started the fishless cycling ~11/6. On 11/20 you reported that you already had nitrate readings.
That's very confusing to me since nitrates normally take a long time to develop from scratch. Did you start with mature media or did you add bacteria to your tank? If not, I can't understand the nitrate readings.
The only other idea I have is that your tap water has nitrates in it. (Some people do and in fact in some places it's quite an issue.) If that's the case, you may be far from cycled, (although it doesn't really square with a nitrate reading of 80 ppm.) I agree with Pops that the test kits may not be giving accurate results.
In essence, the nitrates are false indicators of a cycled tank, and that you instead have yet to develop a bacteria to eliminate nitrites.