Questioning my OPKs

Ok, so I'm CD 14 today and I've been using OPKs since CD 10 and about an hour ago I took one (the last green one) and to me it looked like it was almost positive so I decided to do a digital. Well, as you can see the digital was negative. It's the clear blue advanced so don't you think it should at least be giving me a flashing smiley face? Could it be a faulty test? Just a little confused since it looks close to being positive.... ​