I do believe that the issues you are having are related to the geriatric physics models of the 747 aircraft right now. Here’s a link so you can vote for the rework!
The 747 is an amazing plane but there are some amazing features about it, that aren’t in IF.
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About The 747
The Boeing 747 is an American wide-body commercial jet airliner and cargo aircraft, often referred to by its original nickname, “Jumbo Jet”. Its distinctive “hump” upper deck along the forward part of the aircraft has made it one of the most recognizable aircraft, and it was the first wide-body airplane produced. Manufactured by Boeing’s Comme…