Has this happened to you?!?!

4 Walmart 88 cent test and all four negative until hour or more after. Test are from two different batches. Yes, I know after 10 min it’s considered invalid. But I find it strange to have 4 test from two batches all do the same. The lines are not gray and do not wash away when water is ran over them. I’m only 8 dpo so I know I know keep testing, but I wanna know if this has happened to any of you and what was the outcome?