Is it just me or has this happened to anyone before?

I feel like im getting mixed readings on opks. I have previously been using test strips and was never able to detect a dark line.

I have recently started using advanced digital and I tested yesterday morning and got a high and did the strips and didn’t see much, i then tested again this morning using the digital and got a peak reading whereas still cant see much on the test strips.

Is it possible the test strips could be faulty or the digital. The digital has been showing no peak, all the way up until yesterday so i have no reasons to believe the digital is not working.

I am also on my cycle day 24 and all my apps are saying I ovulate today so surely the digital is not wrong? why are my strips not showing a dark line?