Blender UV Unwrap - Face Not Mapping Correctly

Support Materials and Textures
#1

Hi guys.

I marked the face of a cuboid as a seam, and then unwrapped it. However, it shows up like the image below:

https://i.imgur.com/02wQU4t.png
02wQU4t.png1289×585

Does anyone know why the face is so thin? Is it because I used edit mode to stretch the object? And, more importantly, does anyone know a solution?

Thanks in advance for the help,

Binkadin.

#2

Unapplied object scale. Object mode, ctrl+A -> scale. Unwrap again.