Can I synchronize WP and BP usernames easily?

I'm still a bit baffled by the WP / BP integration, and the use of two usernames.

I would like our users to only have one username, as asking for two is confusing. Is there a setting I'm missing or a plugin that will synchronize the two, or do I need to have this custom coded?

Here is our registration page, if you click on the Inspector signup button, you'll see the two username fields.

http://www.jewelorjalopy.com/registration-page/

I'm also using the membership plugin, but don't think it applies here.

Thanks!