Clearblue ovulation test confuses me

Well, I have been using the Clearblue ovulation kit for the first time this cycle but I am confused. My cycles are irregular so I started testing on CD 15. Got 6 negatives and the next day a smiley, NOT "blinking" but fixed. It has been like this for another two times (yesterday and today). Did I go from not fertile to very high in one day? Why does it still show the fixed smiley after I tested? The hormone level should drop to not fertile after ovulation but it hasn't. Could someone please help?