wrong

[Quagmire]

Its possible your going through a second smaller cycle.You get all this bacteria from the cycle,lots of Amonia being turned into Nitrites by one type of bacteria,then Nitites being turned into Nitrates by another type of bacteria.So then you have all these Nitates,and all those bacteria,but they are starving because to them, Nitrates are just waste.They starve and die,causeing Amonia,and starting a smaller cycle.Give it a bit more time,shouldn't take too much longer,there will still be some bacteria of each type so your not starting from square one.