I am wondering if you are confusing "drive modes" with "exposure modes" on your mode dial, since you say color balance was ok when set to the "Automatic" mode. There is an ""Auto" setting on the mode dial. You say you were using 1/3 EV adjustments, so I assume you were using the +/- comp control? However, there is also an "Auto" setting in White Balance settings. Could be a WB problem, depending on this setting.
I do agree with UncleV. that if shooting JPEG images, the default setting for Custom Image processing is usually the "Bright" category, but if your mode dial is set to "Auto" then the Custom Image processor might well be switched over to "Auto" also, which could employ which ever category the camera "thinks" is best. But then having your mode dial set to "Auto" disables most controls and adjustments, so you lose control of your camera. The "Bright" category is great for most uses, but it does entail higher contrast, increased sharpening, and a more saturated color palette. For high-contrast scenes, and others where you'd want less enhanced contrast, and a less saturated, more neutral color palette, you could go to the Custom Image settings to temporarily switch to the "Natural" category for the situation you are facing. You can also go into the menu of whatever category you have chosen to operate, and make changes within it as to sharpening, color saturation, contrast, etc if you wish.
Last edited by mikesbike; 03-01-2021 at 10:31 PM.