OPK's are confusing!

SKD • Lost my baby girl at 20 weeks February 2015. Rainbow baby boy born January 20, 2016🌈👶🏼. Early MC May 4, 2017. Second Rainbow baby boy born March 18, 2018!🌈👶🏼 💗Shayla Rose👼🏼💗 💙Royal Holden👶🏼💙 Lucas Stephen 👶🏻💙
Has anyone ever gotten lines on opk's or high fertility days, but no surge?  I had tested 8 days straight; all in the morning after longest sleep. I used digital for four days which showed high fertility, then ran out, so I used the sticks and this is what I got.  Looks like the one could have been positive if I tested that night, but I didn't.  Any suggestions?