FRER disappearing line

[ACMJ]

Hey, Has anyone ever had double with a disappearing line on a frer? The picture I have attached is after 1 minute then a minute later the screen was black and a stone cold negative? What does this mean??

*trouble

Yes, this happens a lot, it’s the dye running past I think. I try now to not look at it whilst it’s developing.

Yes when I was ttc. Had a line that appeared and stayed for 20minutes then disappeared. It was definitely a dodgy test because I dipped the second in the pack in the same urine and it was bfn.