Anyone familiar with the Clear Blue Advanced OPKs?

I had 3 sticks left over from last months machine so I used them the past 3 days. I got a “low” the first day (CD8) , then got a “high” yesterday (CD9) and today. I tested again tonight, to make sure I’m not missing my peak, but I had to use my new box with the new reader and new sticks. It came out low.

Is there something with trying a brand new box? I’m definitely rockin some EWCM so I would imagine it’s near.. but what’s going on?! I’m CD10 if that helps!