Why does Everything look Stretched While using a prefab?

I was making endless runner game and i just completed the platform that spawns in a deletes. It spawns in using a pre Fab of the ground but when add obstacles to the pre fabs the obstacles image is show stretched it is unplayable, but the collision colliders stay put Here is a Picture.

But here is how it is supposed to look like

please and thank u

Possibly your camera is set to isometric mode. Just a guess… Try going into the main camera in the hierarchy and setting projection to perspective.