Let me correct my previous statement. The printer grabs from tray 2 (8.5x14) by default when making photocopy. It grabs paper from tray 4 if manually select tray 4. If I don't select tray 4 before copying, it will grab paper from tray 2, which has 8.5x14.
What is the original size set to? This is implying it is either set to legal, or the sensor sees the original as being legal when it isn't. If it is the sensor, you would need a tech
Printing seems to be fine. It always default and gets paper from tray 4.
This confirms it is a settings issue or sensor for the original then, the sensor isn't used by prints obviously.
I see tray 4 settings for paper size is A4 (210 x 297 mm) and I cannot change it to Letter (8.5x11")
Move the tray guides out then in and close the tray, if it still says A4 the guides are no longer attached to the sensor and you need a tech