I just wanna know how this happened.

[Wizard Kerbal]

I had an idea for something cool. I would put my retired aircraft next to the dessert airfield, and in a while, it would look cool!

But then, I'm investigating the temple, and notice something weird when I take off. When I return, I investigate it and- 

The first plane at the graveyard, which I parked there facing the runway and obviously right-side up, is parallel to the runway and upside-down. I just want to know how this hapened happened.

Edited October 5, 2021 by Wizard Kerbal

[Vanamonde]

Loading a save can cause the ground to snap into position, lobbing parked craft into the air. I don't know why I've never had trouble with it myself, but others have reported it. 

[18Watt]

23 minutes ago, Vanamonde said:

Loading a save can cause the ground to snap into position, lobbing parked craft into the air. I don't know why I've never had trouble with it myself, but others have reported it. 

The effect seems to be worse when a vessel is supported by landing gear or legs, or has robotic parts.  I’d suggest retracting the landing gear while it’s parked, but I see the nose gear is not retractable.

Also, try turning down a few settings of the landing gear, you may need to enable advanced tweakables for this.  Try turning spring strength to zero, and damping to max.   That’s only a temporary fix while the aircraft is parked, if you fly it again you’ll want to bring the landing gear settings back to reasonable values.