u/CdatKat

This is the silliest "Bug" I have ever seen, and took me 2days to solve.

only the blue side had the color blending into purple

I was baffled on what the fuck was happening, and after googling a bit the culprit was...the human eye is bugged.

If you have a pure Blue thing blend near a white thing the rgb near by is something like (0.3, 0.3, 1) which our eyes perceive it as purple. The fix just add a bit of green so it looks more blue. (I bet somebody in the comments will explain the color theory in play far better than me.)

The result of adding a bit of green to make it more blue.