Evap? Indent?

Every FRER test I have taken shows a vvvfl but I think itโ€™s a indent ๐Ÿ™ I got to work took a test and after 3 minutes I went back to work and a hour later there is yet another line on the test... why do I always get indents ๐Ÿ˜ญ *last 3 pictures is from today*