Wondfo vs Clear Blue Digital

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Hello ladies!
I ordered the Wondfo ovulation strips from Amazon so I could test twice a day and not miss my surge. We had an apt with my GYN yesterday to discuss his SA. Long story short.. His SA was mostly normal, he has low motility, but she said she wasn't concerned about it at all. 
My question is... I have yet to get my LH surge with the Wondfo strips, I have been getting faint lines, but nothing obviously positive. However, I had one more clear blue digital left and was curious because I am having some O pains and EWCM. The digital went straight to Peak Fertility today and my Wondfo strip is still "negative". With the CVS strips I was using, I always got a strong positive that correlated with my digital. Are my Wondfo's faulty? I've read differing opinions on Amazon. We have been BD'ing every other day just in case, but wanted to see if anyone else had had trouble with the Wondfo strips? Going to go pick up my trusty CVS strips on my lunch break. 😊 Sorry for the long post!