That’s not necessarily what’s happening. Colors can be very different depending on what type (color) or light is used to illuminate it. To be sure I would first check your white balance. You can either set it manually, or select the closest to what you’re using. I’m guessing that you’re using incandescent or fluorescents? Try setting that, instead of the auto-select, and see how it does.
If that’s still not doing it then try the custom color settings. There’s usually a bunch of presets (Nominal, Skin tones, Vivid, etc), and a lot of Canons let you individually set each color channel. I’ve always found that my Canons overexposed the red, so I used to turn it down a bit.
