Marketo connector issue

Hi,

We are currently trying to synchronize our contact from SugarCRM to Marketo, thanks to the connector provided here : Sugar Connector for Marketo SugarCRM, Inc. 

But we have an issue, some data value change in Marketo without any modification in SugarCRM.

For example the billing address in marketo change from "the right address" to "null"

If i'm looking in the CRM, the billing addresse are not changing.

Could you help us on this subject ?

Regards,