Size of Textfield not working

When setting up my content type and and adding a US Zip Code, I configured the textfield to be length 60 (default). After saving the configuration, I create a new content of the type I just created, and the text field length goes across the screen.

Steps to Repro (assuming module is already installed):
1.) Create Content Type
2.) Add New Field called Zip Code
3.) In the next page (while configuring) leave all values at default (Length should be 60).
4.) Save
5.) Create new content of type that you just created.

Notice that in the node/add page the zip code textfield goes all the way across the screen.