Help!!! OPK vs Fertility Apps

Rachel

I have 3 or 4 <a href="https://play.google.com/store/apps/details?id=com.glow.android">fertility apps</a> I’m using to TTC. ALL of them showed I was ovulating yesterday or today. But my OPK yesterday and today were both low (open circles on clear blue advanced digital). I took pics of the blue lines from my OPK.

Could the OPK be wrong?