Nav mesh moves on play not sure why.(help)

I dont think I made a change to the nav mesh, I just when to work on my project yesterday and the nav mesh would move when I press play.
This is what it should look like:
https://forums.unrealengine.com/core/image/gif;base64
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This is the once I hit play:
https://forums.unrealengine.com/core/image/gif;base64

I have just under a week until