Walmart cheapies duds?!!!

SOOOOO, I’m 12 Dpo… obviously ttc and I felt like I was pregnant. I’ve been using walmart cheapies since 9 dpo and seeing vvvfl that dry slightly darker. I wanted to know if the new tests weren’t as sensitive, so I went and got a cb red dye 6 days sooner. AF expected in about 2-4 days, so I was getting discouraged until I saw this immediately. Excuse the lint on the walmart cheapie… I had it in my pocket for a sec…. but OBVIOUSLY there is a difference. This is on a 4 hour hold not fmu.