Duplicating custom meta in WP e-Commerce

Hi,

Our client’s site has been running for a little and since yesterday, when they’ve added Custom Meta fields, some of the content (one name/value pair) is duplicating itself which we cannot pinpoint the reason for.

If we delete the the one entry, the problem is sorted.

Is it possible that there is a bug in WP e-Commerce where Custom Meta duplicates itself?

Here’s an image to the show what I mean.
https://docs.google.com/file/d/0ByrUaUOlJSbuR3k0cUt2UFhEaVE/edit?usp=sharing

Many thanks.

http://wordpress.org/extend/plugins/wp-e-commerce/