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I'm pretty sure it's your fertile CM that is throwing FF off, not the OPK or temps. For kicks, take our the fertile CM on CDs 17-19 and see if it changes everything.
You could have caught that +OPK late in the surge. What time did you use it? How long before that one did you test? There have been times where I got a +OPK early in the day and then I think I oed later that day or during the night.