Evap line

Is someone able to tell me if an EAP line is always thin and off centered or gray? I’m asking because I took a test this morning with a blue dye within the five minutes I saw a very very.

faint line. But it has gotten darker over time where it’s more noticeable it’s clearly blue. I took another test and the same thing happened. Neither were the first urine of the day. Plan on retesting just was wanting some input. I did edit the photo because it is hard to see.