Negative test viewed after time frame

I know not to read tests after the time period is up. But I have never in my life had anything show up past the time frame, not even an hour later like this one. I know it’s negative and I’m not worried about it. I’m just wondering why the evap is pink and so close together lol. Who has been pregnant with a test like this? Or is it a dye run? It interests me because I’ve never in my life had this before out of the thousands of first signal tests I’ve taken. Just wanted some insight. Once again, I’m aware it’s invalid! I’m just curious :) thanks so much!