First Response vs Clear Blue

I did the first response test 8 dpo, and i got this result:

The morning after, i did the Clear Blue pregnancy test and i got this:

Both tests have are “6 days earlier” sensitivities

I dont see the line on the clear blue, but i see it on the first Response, although the first response was one day earlier.

Is that normal/fine? I had a miscarriage 1 months ago