Clear blue digital vs other OPK

Nicole
I am using the clearblue advanced digital opk as well as a regular opk. Both months I have used two, I get the solid smiley 2-3 days before the regular one. Like this month the clearblue showed positive on Wednesday and the other opk was not positive until this Saturday, 3 days later​. I'm so confused, when am I actually ovulating? Anyone else have this happen?