What shutter speed? Fast shutter speeds might be able to cause this, the effect is horrible with fluorescent lighting that does not use electronic ballasts. Do you have a dimmer on the tungsten lights? That can flicker at slow enough speeds to cause issues.
Check and make certain that there is no fluorescent lighting that might be off to one side but still contributing to the overall light, and no dimmer. A slow shutter speed (1/60 or less) should not show effects of lighting color changes, try that and see what happens.
It is unlikely to be a camera issue.
BTW, there is a limit to file size on uploads. Make a copy of your file reduced to 800 X 800 @ 96 dpi and it should upload fine