That's really cool and weird at the same time.
It has been my experience that many inexpensive cameras have a lot of difficulty handling the sun - in fact, it's so prevalent that it's one of my key questions now when looking into buying a new camera - can it handle the sun?

Even one of my more expensive cameras (disappointment from the outset on that one) had great difficulty handling some sunset pictures I took. It was really frustrating.

Not sure why yours is doing purple though.