Hmmmmm. Will it do a paper advance calibration?
Sometimes that will work to clear things up. Then you can try to calibrate again.
One other idea. Cut a piece from a roll, 13” x 19”. Decurl the roll piece - make sure it’s flat.
Try loading sideways. If it loads, try calibrating.
But do advance paper calibration first.
I seem to remember someone had a similar issue as this a while back on the forum.
You could try an exhaustive search.
Good luck!
Mark