Why are some "updated app" dots brighter? Since updating to iOS 10, when I update my apps, some of the indicator dots are bright cyan instead of blue. For example, Deltek in the screenshot (compared to Sheets). Why?

edit: In response to IconDaemon's comment, first, the light color was constant as I swiped to and from the page, with the background stationary. Second, I just checked again, and it's now the normal dark blue (see below). I didn't change the background or transparency settings. It might just be a bug, but I don't think it's an illusion or background interaction.

edit 2: I just updated Facebook Messenger and it happened again. The dot is bright cyan, regardless of its position against the background. Then after I use the phone for a few minutes, it changes to the normal color. 3 images showing the bright color, followed by the dark color: http://imgur.com/a/evip7
I noticed some of the dots on mine were a lighter color several hours after an update was downloaded, which would blow my theory about timing, so I tested changing wallpapers to see how that affected the color. This showed that the color of the dot is impacted by the wallpaper. It may be semi-transparent or the color may simply be chosen by the system based on the color behind it.

The below images were taken within a minute of each other after changing the wallpaper. The first two show changing from a light wallpaper to a dark one. The second, third, and fourth images were all taken with the same wallpaper. You can see the color darkens as the background darkens. In the fourth image, it even varies slightly between rows based on the differing shades in the background.