OPK Help!! I’m so confused!!

I have been using the CB ADAVNCED opk because I found the strips harder to use while at work having to scan them and everything. Well, for 5 days I got the flashing smiley face and finally Saturday morning I got the stand still smiley which means PEAK. HUbby and BD’ed and we were thrilled because he had to leave this morning for work. Well, I just took a test to make sure my levels were going back down and on a strip I got this which is showing what looks like a peak.

How is this possible? Do your levels stay high for a couple of days after you peak? I’m scared now we did it too early and that today would have been the best day to BD.