Help! Positive OPK 3ish days after POS OPK

Emily

I took an ovulation test the 13th, wasnt ovulating- took one the 14th, was positive but not peak, hot my peak the 15th with a blaring peak and i took another one last night and it was also positive... now Glow has changed my ovulation day to the 20th... does this mean im not 4DPO like id thought? How do i take this!?!