Object shown in different places between mods

Question

It's normal in object mode but in edit mode this is what happens to floor object.

---

This is object mode view. .....

Answer 1

You have a Displace modifier, it changes the position of the vertices when you're in Object mode, and the vertices come back to their original position when you're in Edit mode. Check your Displace modifier settings if you want the vertices to stay at about the same Z position.