Why is my level falling?

I’m new to UE4 and i was fine up until i moved my characters spawn point. Now my whole level just drops when i hit play. Any ideas or have i completely broken it?

What does this mean exactly ??? Makes no sense for me
But maybe this helps you:

https://docs.unrealengine.com/latest/INT/Gameplay/HowTo/SpawnAndDestroyActors/Blueprints/index.html

try to create an empty project or a new third person template or similar.

Basically i start with pic1, and its fine. Then i play it and the ground moves away from the player start. the second pic is looking downward

Please try to recreate the player start by deleating and recreating it: https://docs.unrealengine.com/latest/INT/Engine/Actors/PlayerStart/index.html
Also is your map ground created by using the landscape mode or is it a normal static mesh ?

Thanks, i will give that a go. If that fails ill try a new scene

landscape mode. it falling isn’t the spawn