Animation Problems (Teleporting)

I was doing a lesson in Unity on animating. I had imported some files into Unity that had premade characters and animations, and I was just exploring around a bit with it. Here's the link:

https://learn.unity.com/tutorial/get-started-with-animation?uv=2020.3&pathwayId=61a65568edbc2a00206076dd&missionId=61a64e25edbc2a0020607564

When I opened up Animation Editor with one of these characters, they were standing on the stage.

Then I played one of their animations, and the character teleported.

Can anybody tell me why the character teleports whenever I preview the animation in the animation editor? The character does the animation normally on the stage in game mode, but when I preview it in the animation editor, it seems to like teleport to the coordinates it was animated in.

I would also like to know how they manage to make those characters stay in the same place in game mode. Thanks alot in advance!