One brand opk always pos & one brand always neg??

So when I use ovuplan opks & they always come back EXTREMELY POSITIVE & when I use this test brand it always seems to be negative while the other is positive. Today I used to this test which is clearly negative & I also used clear blue advanced with the same urine and got flashing smiley faces. If I'm about to hit peak, I should be seeing at least some form of second line on this right? What opks do you use and are actually reliable? It seems any that are even moderately cheap just don't work for me....