Why is iOS Duplicating My Screen Captures?

Episode 1845 (26:10)

George from New York, NY
ios 15

George has an iPad Pro and after the recent iOS15 update, when he does screen capture, he gets duplicates! How can he stop it? Mikah Sargeant wonders if a shortcut or something like If This Then That is doing it. But George says he doesn't use those. Or, since George has an iPhone, the Photos app may be syncing the iPad photos to the iPhone, making a duplicate. 

From the chatroom - This is similar to a problem that happened in iOS12. Check out this discussion on Reddit - https://www.reddit.com/r/googlephotos/comments/a5xklq/duplicate_screenshots_in_ios_12/