Duplicate records

Every couple days we are noticing a massive duplication of stores in the admin. Each retail store (post_type=pazzey_store) will be copied 10 times, so we find ourselves with 6000 records (store locations) instead of 600.

Every time we have to clear the database and insert the original 600 again, until the duplication appears, usually in a day or 2.

Any idea why this is happening?

And more importantly, how can we prevent it?

Thanks for your help.

http://wordpress.org/extend/plugins/pazzeys-store-locator/