Digital OPK inaccurate?!

Question

My digital OPKs have all been having a blank smiley. I decided to get some of the simple OPKs and yesterday and today they have been positive. The digital ones are still showing a blank smiley. Is there a chance the digital one is faulty?! Also I had a lot of EWCM Saturday and Sunday. 
Below are the two tests together. Lines on the right are the tests, left is control.

This is a pic of my digital lines a few days ago.

Answer

Did you take them prior to ovulation? From my experience you need to take them well prior to ovulation as I’ve heard they adapt to your normal levels of lh. I also like the dual hormone rather than single lh pink clear blues as it tells high and peak fertility. Do you have a pic of the other ovulation test?

Digital OPK inaccurate?!

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