Amazon opks

Hi all! Like a lot of you I have been using the cheapie opks from Amazon that come in a huge 60+ amount. This month I decided to try a different brand (Easy @ Home) and I am in awe of what is happening. Easy @ Home just gave me a positive opk whereas the cheapie Amazon one had a faint second line still. This has blown my mind as it appears I ovulate sooner than I thought I did and it means that I have a longer luteal phase that I thought as well. I do get positive opks on the Amazon tests, but it's usually 3-4 days after I have egg white CM (which is why I decided to compare the two this month) I am so angry and also excited that I have found this out. It means my bding will be more productive (hopefully!)  Has anyone else experienced anything like this before?