It is normal for games to have all kinds of weird glitches when system is "too fast" or game is made before AGA existed etc..
WB errors looks like some part of system misdetects color space endian (RGB vs BGR) but part works correctly. Looks quite strange. Probably some software conflict or some weird Picasso96 version. I have never heard basic WB setup having this kind of problem.
But note that there are many RTG compatible games that will have this kind of color problem because they assume specific color mode (most display cards back in the day had RGB color order, later ones were mostly BGR)
You can try disabling/enabling WinUAE RTG panel color modes (RGB vs BGR) to work around it. RGB probably fixes it. BGR is the default because it is more optimal in emulation.
This is not emulation problem.
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