"The anomaly is the creation of a cartouche being reused by following generations. The initial carving was made during the reign of Seti I, and the stone was later reused during the period of Ramesses II with one carving being on top of the other. This palimpsest effect coupled with erosion creates the carving in situ."
That's pretty obvious when you notice that those aren't anywhere else in all of Egyptian record keeping. Which is pretty remarkable. If giant flying machines existed they would be noted frequently.