Positives only on cheap Equate + target brand blue dyes

Hey all! So I’m 11dpo and I’ve taken 10 tests between yesterday and today- so far every cheap blue dye (Walmart and target brands) are very faint positives... tried with husbands pee just to see and it was definitely negative for him lol

However- every frer has been negative... has this happened to anyone else??? Could they all be blue evaps?