Help issue with clear blue digital OPK

Jg
Question about clear blue digital!
So I have used this test a couple months ago and had no issues had the low, high and peak reading. But this month I purchased the one month supply and started testing when the instruction said to and I had the low and then it went to 6 days of flashing smiley faces. 
I ultimately ran out of tests and had to go buy another month kit and then took the first test and it went to LOW!? Today I woke up and took a test and the flashing smiley face is back? I am very confused as I felt like I ovulated already based off of CM and temperature readings from BBT. Do you think I didn't ovulate yet or the clear blue tests just wasn't working right?! Please comment! :)