Clear blue ovulation tests don’t match up

I bought 2 boxes, so 2 holders. I have done this with 2 other pregnancies and they never line up and the same thing. Like tonight, I got a peak on a a regular ovulation test, I got a peak one on clear blue holder (never used, brand new) and a low fertility of the 2nd brand new clear blue. Same urine, ran at the same time. Can sometime explain that to me?! In inclined to believe the one was peak bc my other off brand with line shows peak but why would the other be low fertility… not even high.. just low. I’m starting to wonder if this is a scam.