Help!! 2 diff opk 2 diff results!

Jenny
Ok I just tested with 2 diff brands of opk  strips. 2nd picture top strip are new brand I got today answer brand opk. this one (the top strip) looks positive to me. The bottom one Is cheapie off amazon and it's a negative. What do I believe? The top picture is the 2 answer brand opk I've taken today. Top strip neg and what looks positive to me bottom strip