Confused! Clearblue advanced digital ovulation test

This month was my first time using Clearblue advanced digital ovulation test and I’m confused!

I Tested on CD 12 which showed low fertility (clear circle), didn’t test on CD 13, then when I tested on CD 14 it had gone straight to Peak fertility (static smiley)?!

Has anyone else experienced going straight from low fertility to peak in two days??

Would appreciate any experience or advice, thank you x