Ok y'all I'm confused

Ok so i've been using the CB advanced digital opk's this month and after 4 days of 'low' empty circle, I got a 'high' flashing smiley. Glow was predicting me to ovulate on the 29th with a 'high' 26.2% after logging 3 of the last 4 days, but I forgot to log yesterday's result. So I did that and logged today's 'high' per the opk, but now Glow is saying theres a 'medium' 14% chance of pregnancy and moved my ovulation back a day to the 30th...what gives? If the opk says high shouldn't Glow?