bfp Walmart cheapie, bfn frer. WTF

Kelsey
I got an extremely faint line (I was the only person who could see it) on a first signal .88 cent and Walmart cheapie.
I took another this morning and the line is slightly darker (see picture) but much more noticeable and somewhat showed up on camera!
So i tried to confirm it on an FRER.. BFN. WTF. 
Has this happened to anyone? Are first signals more sensitive or something? Are they evaps? I need input!