When typing in a default value for a string property and the values is Alpha and Numeric

Summary:

When typing in a default value for a string property and the value starts with a number and followed by alpha, it drops the alpha. For example, I have a string property with a Specified Default setting, and I want the default value to be 500 West Main Street. When I type it in and hit save, it changes the default value to 500, dropping everything behind it. If I move the alpha to the front and the numeric to the back, it all stays. Is this expected behavior? How can I get 500 West Main Street to be the default value?