I can’t tell you whether you have ovulated or not, but the results you are getting DO make sense. Like the PP said “the monitor tests both estrogen and LH. When it detects a rise in estrogen, you get a 'high fertility' reading. Then, when it detects a rise in LH, you get a 'peak fertility' reading.” Wikipedia has a nice chart that shows the relative levels of hormones.http://en.wikipedia.org/wiki/Menstrual_cycle
The line closest to the pee end of the stick is the LH line and the second line is the estrogen line. So in a normal cycle the estrogen line will get darker at first, but then starts to get lighter. When that happens the LH will start to get darker and you will get a peak reading. Then the LH line will go away and the estrogen line may or may not get a little darker again. Which explains the results that you got last month. However, the monitor works by comparing the blue line to the white background. If you have a situation where you have a big blue smear where the LH line is suppose to be then the monitor will read it as a positive because it is basically a stupid machine and can’t tell the difference between a big blue smear and a blue line. From there it kind of goes on automatic pilot and gives you a couple of days of peak and then a couple of high irregardless of what the pee sticks are saying. It is sort of guessing based on your previous cycles.
So, as for customer service…she is full of it. Of course she is going to tell you that there are no false positives, she wouldn’t want you to lose faith in the monitor and stop spending money on their test sticks. They also don’t like to give out information out on what the lines mean because they don’t really want you to know how the machine and the sticks work because once you do you don’t really need the monitor and how else are they going to justify $200 for the monitor.
The machine is not fool proof, but can be a great tool in additon to other ovulation predictors (BBT, CM, cramping). I've had smearing issues too, as well as problems with the stick not wicking which can really muck up your results. I have the protocol for resetting the machine if you ever want to reset it.
Whew! Sorry for the long-winded response. I hope it makes sense.