I'm pretty sure it's because you had a "fallback rise" after ovulation, which the FAM doesn't recognize. It looks for 3 days of higher temps that do not drop. Like I said, it only works for a few women, so I would just go with the one you have marked yourself on CD27 and ignore the FAM for now.
That may be why it was put there. BBT thermometers are a lot more accurate. If nothing else make sure since you got it on there now. That if you dont get a BFP this month that you temp. with the BBT thermometer all next month at the same time perferable every day. Good luck! And tons of baby dust.