The White backing on the ADF when you open it , either that has something on it that the printer picks up as the paper edge, or someone doing an unrelated thing, changed the default original size.
So check the white matt on the lid, and if nothing, change back the defaults.
To do so, at the copier log on as admin and go to Machine Status > Tools > Service Settings > Copy Service > Feature Defaults > Layout/Adjustment > Original Size > Auto Detect > Save > Save defaults