Online stores often have the worst titles, clearly entered by some minimum wage employee whose job it is to put 20,000 releases on the database before lunchtime.
So I often change online sources to something useful/useable/consistent. Not every time, but often.
I do feel bad about it when I do it though.
I'm not sure if we have a guideline applicable to this though. More of an unwritten guideline of "online storefronts have shit data". I think a rule like "always match cover art" would probably become problematic in some cases.