Disappearing positive First Response 6 days sooner

Mikayla

Has anyone ever encountered a disappearing vf line from fr? I saw a very faint line, even have pics below. It showed up within 5 minutes, and now I barely see it; though only when I hold it up against light it's shadowy but faintly there. I've retested 3x and same issue on three! I'm 11 dpo, used fmu.