Google Checkout - Duplicate shipping name FREE SHIPPING! found

First: I didn't post in the google checkout thread because that thing is massive, and impossible to search through ;)
Second: I *tried* to search for this issue all over, but I'm just not having any luck finding an answer.

So, problem:

Checkout with google checkout fails. The error I see in the integration section of the sandbox site is this:

Code:

Duplicate shipping name FREE SHIPPING! found. <?xml version="1.0" encoding="UTF-8"?> <checkout-shopping-cart xmlns="http://checkout.google.com/schema/2"> <shopping-cart> <items> <item> <item-name>Hold Fast T-Shirt</item-name> <item-description>[Size:Large] [Color:Black] </item-description> <unit-price currency="USD">22.99</unit-price> <quantity>1</quantity> <tax-table-selector>Taxable Goods</tax-table-selector> <merchant-item-id>189:284b98a5a9c1d733180cdb1f07a01b0e</merchant-item-id> <merchant-private-item-data>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</merchant-private-item-data> </item> </items> <merchant-private-data> <session-data>ajrjf2ipj6pfodqek1eq0sloq6;zenid</session-data> <product-data>;189</product-data> <ip-address>69.106.4.23</ip-address> </merchant-private-data> </shopping-cart> <checkout-flow-support> <merchant-checkout-flow-support> <rounding-policy> <mode>HALF_EVEN</mode> <rule>PER_LINE</rule> </rounding-policy> <edit-cart-url>http://www.mommasboyproduction.com/cart/index.php?main_page=shopping_cart&amp;zenid=ajrjf2ipj6pfodqek1eq0sloq6</edit-cart-url> <continue-shopping-url>http://www.mommasboyproduction.com/cart/</continue-shopping-url> <request-buyer-phone-number>true</request-buyer-phone-number> <shipping-methods> <flat-rate-shipping name="FREE SHIPPING!"> <price currency="USD">0</price> <shipping-restrictions> <allowed-areas> <world-area /> </allowed-areas> </shipping-restrictions> </flat-rate-shipping> <flat-rate-shipping name="FREE SHIPPING!"> <price currency="USD">0</price> <shipping-restrictions> <allowed-areas> <world-area /> </allowed-areas> </shipping-restrictions> </flat-rate-shipping> </shipping-methods> <tax-tables> <default-tax-table> <tax-rules> <default-tax-rule> <rate>0</rate> <tax-area> <world-area /> </tax-area> </default-tax-rule> </tax-rules> </default-tax-table> <alternate-tax-tables> <alternate-tax-table name="Taxable Goods"> <alternate-tax-rules> </alternate-tax-rules> </alternate-tax-table> </alternate-tax-tables> </tax-tables> </merchant-checkout-flow-support> </checkout-flow-support> </checkout-shopping-cart>

So, I assume it's complaining about the duplicate FREE shipping sections in that XML, but I can't figure out why. I only have one shipping module configured, and that's the free shipping one.

Any thoughts?