When turfing, I've noticed that the colors do not match. Here is a picture about it. The darkest red color to the right are turfs that I had previously gotten before Mr.Moose changed them to black. (I changed to red to test)
Now the lighter red colors are new turfs that I recently got.
Resolved, turns out to be duplicates and overlapping turfs are only claimed once. This lead to different alpha values when changing the colors. Thanks for noticing, less turfs saves many CPU ticks.