Need help with Username Fullname configuring

When configuring Gallery, there is an option for what to show when a photo is uploaded as far as a Username, Fullname (Username), etc. I have set it to Username, but the Fullname & Username both show up for photo ownership when a photo is uploaded.

How would I change this to just show their username, and keep their fullname private?

Thank you.

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The following information is required to get an answer:
Get this information from the PHP diagnostic (in the configuration wizard).
Gallery URL (optional but very useful):
Gallery version: v1.5
Apache version:
PHP version (don't just say PHP 4, please):
Graphics Toolkit:
Operating system: Windows XP
Web browser/version (if applicable): IE 6.0