The red ring is chromatic aberration that comes from the lens not reading all wavelengths of light. Avoid wide-angle lenses and use a narrower aperture and compensate with exposure time. High-quality lenses reduce this optical phenomenon. Image editors have chromatic aberration correction functions. But shooting in RAW is essential. Also check the settings you are shooting with on the Olympus M10 Mark III. I have also been photographing with this camera and we have to pay attention to the many possible filter and configuration settings. Even in "AUTO" we can customize some things such as colors, contrast, etc. An excellent camera but one that requires knowing its options well, which are not always intuitive.
