Thoughts?

I’ve been using these strips and Clear Blue digital ovulation tests, which are supposed to say your two most fertile days. Tuesday both were negative, Wednesday both were positive, Thursday Clear Blue was negative and this was the strip, which looks to be the same as the control line? I’m just confused as to why I’m only getting one positive day on the clear blue. It happened last month as well. I’m testing at the same time daily, consuming similar amounts of water etc. Just looking for some similar experiences others have had!