Heuristics are a way to try to detect viruses by looking at behavior. It is prone to false positives, because it's not a real signature match - it's just a guess. It is designed as a defense against viruses that change their own code, which is a way viruses try to avoid detection by signature matches.
Since Stardock software does things in non-standard ways, which is how they make things like desktop skins possible, it is understandable their software could get accidentally marked.
If you're getting Stardock software from their official site, then it should be safe and is very likely just a false positive.