NOT all OPK’s are made the same!

Ha

Normally I use wondfo but I ran out this month so I bought this other brand (LotFancy One Step Ovulation) off eBay because it was faster delivery-but they are complete BS!! My friend had some extra wondfos that she gave me so I could compare the two (top LotFancy, bottom Wondfo) I should be getting my LH surge either today or tomorrow. How are they so different?!