This just happened to me recently, my grandparent's marriage had 16 sources attached to all, all were the same manually entered source. I know that I only entered it once. Another couple had 8 marriage sources, all identical and all had been attached through ancestry. These are just sources, not media files. Last night I spent two hours just trying to clean up a few people and re-syncing.
I have also noticed that residence facts, from censuses, are showing up in dupes and triplicates. As the above poster noted, these are facts that are attached to multiple people - all the people in the family.
All my sources are attached in ancestry, or manually entered in ancestry. When I sync, I do it from FTM manually after compacting. I am not looking forward to going through the thousands of people in my trees looking for dupes.
I have also noticed that residence facts, from censuses, are showing up in dupes and triplicates. As the above poster noted, these are facts that are attached to multiple people - all the people in the family.
All my sources are attached in ancestry, or manually entered in ancestry. When I sync, I do it from FTM manually after compacting. I am not looking forward to going through the thousands of people in my trees looking for dupes.