As always, platform, hardware info would help us better answer your questions. Could be shader differences with your hardware. this looks like the color is over/under saturating and wrapping around the 8bit color space, but that’s just a hunch.
First suggestion would be to try bypassing different sections of the patch and see which processing module is introducing the bad color effects, and maybe try changing some of the controls. Chances are, if you are using a MacBook (non-Pro), you’ll be limited in what you can do with jit.gl.slab because of the on-board GPU not being intended for high end image processing.