Clearblue Ovulation Monitor showing Day '12' twice???

[FloatingKiss]

Hi all,
I'm using the Clearblue Ovulation Monitor this month to find out my peak fertility day as I have to have a procedure done 7/10 days after I ovulate...

But yesterday my monitor showed Day 12 and had 2 'bars'... today it also showed Day 12 and had 2 'bars'....

Surely this isn't correct?
Has this month now been 'messed up' and do you think that I can rely on the results that the monitor gives to me?

Any advice will be gratefully welcomed.

thanks
FloatingKiss.