4days of flashing smiley?

I'm using the Clearblue advanced digital opk. This is my 4th flashing smiley. The empty circle means low Fertility day, the flashing smiley means high Fertility day, the solid smiley means peak fertility day. On the box (and instruction page) it says you usually get two high fertility days and the following day is supposed to be a peak fertility day. What's with the 4 flashing smileys??? Anyone else had this happen to them, any thoughts or ideas?