Is this always the case? Devas and Brahmas don’t see any undesirable sight but if they come to the human or lower realms, they might. But, I don’t think this is because of their past bad kamma. They have the choice to not see any undesirable sights if they just stay in their own realms. If they use their divine eye to see the human and lower realms, they could also see bad sights, but again I don’t think this is because of previous bad kamma committed in the past.
I also don’t think previous bad kamma can produce its results in the deva or brahma realms.