I think you're scanning over the borders. I haven't shot 110 film since the late 1970s, but I have scanned some old 110 negatives just a couple of years ago. Those negatives have rather heavy masking pre-exposed on them, including frame borders and frame numbers. The 110 camera I used in the 1970s was a Sears fixed-focus model, and it exposed beyond the pre-exposed borders on the film. I don't recall from my scanning what color the pre-exposed borders were, but of course that could easily have changed between the 1970s and today. I'd just crop away the problem area and call it good.