Hi, my name is Di and I am one of the hosts here
With the beginning of ur next cy, I would try resetting the memory and starting a fresh.
R u also using OPK's to detect O'tion?? U say that ur getting 2 lines on the test sticks, which line is darker, the left or the right line?? If the left line is darker than the right, then O has not occurred yet, but if the right line is darker or getting darker, then O is either imminent or has already occurred.
I highly recommend using OPK's along with the monitor, that way u can be sure of detecting O'tion.
There r some pictures of what the test sticks should look like in the FAQ sticky thread, u should check it out to compare ur test sticks. There r also the reset instructions to help u reset ur monitor
I hope this helps hon

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Goodluck and babydust to u.....