Data.com: Lead Assignment issues
|Knowledge Article Number||000159820|
|Description||Why is Data.com reassigning leads to a different user from the one who imported the record?|
|Resolution||Data.com will respect all validation and workflow set up in your Salesforce, including Assignment rules. To keep Data.com imports with the importing user, you can add a line to your lead assignment rule that will not reassign Jigsaw sourced leads.