Confusion about high results on OPK

Lexi

Yesterday was my first day after AF. I did an OPK and it turned up low. Today I did another OPK and it turned up high. I am several days away from my higher

fertility time according to this app and won’t ovulate until the 29th according to Glow. I am really new to this whole process and don’t understand how I could have high levels today. Any help would be appreciated.