Diff Ovulation tests, diff results

I'm using Clearblue Advanced ovulation tests as well as Wondfo because I was wary of my results last month.  Friday I got a "high" result from Clearblue and a negative from Wondfo (expected), and then Saturday and today I got positive peak days on Clearblue.  Saturday the Wondfo text was not quite positive, and today the same thing. Has anyone had different results from different ovulation tests taken with the same urine sample?  I'm also taking bbt, so I've got it all covered, I'm just curious about it.