Well, first off, I looked back and it was actually Dani's eyes that seemed to have nonwhite color in them in that panel. Secondly, this was so with both a desktop monitor and a phone. Just an oddity for me, I guess.
Maybe
To be fair (to you) our ability to perceive colour is very similar to our ability to perceive smells. And colour is a really strange thing, when it comes to what each of us sees because we don't ever see it in isolation but in context. I've studied other bits of art or photographs (and it's way more obvious with photographs) and thought "Oh, I like the way the light falls in this" so I've copied the colour - photoshop allows me to use a pipette tool the simply select the exact colour. But, when I've put what I thought was a deep blue shadow into my own painting, it's turned out to be a muddy brown or a pukey green! Your own eyes, brain and all the surrounding colours (as well as the composition of the image) turn it into the colour that most suits. A flesh tone - for instance - can look anything from yellow to orange to red depending on whether the surrounding colours are blues, greens, purples or blacks. It's a surprising phenomenon when you really start experimenting with colour
But you are right....I tend not to do the eyes bright white (the teeth are actually a greyish green colour - in the main) - eyeballs aren't bright white (in real life) and I don't think PK's or my style suits a flat comic style really
I just wanted to reassure you that the colour of the eye ball wasn't some secret signifier...