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Its counting the dry up days of CM since your last day of recorded fertile CM. You didn't record anything on the day it skipped, so it moved on to the next day of recorded CM. They count 4 dry up days along with 3 sustained temps above your cover line as evidence of ovulation. Its more beneficial to those using FAM as a means to avoid pregnancy so they know they can have unprotected intercourse and not risk catching the egg.
P is for your peak fertile day - the best chance at conception if you inseminate on that day. I'm not sure why it has the fourth day, but to confirm O you need to have three days of infertile CM. I imagine its a setting you have set to have the fourth day dry.