You likely have one or more Business Rules running on the sc_task (or task) table, but check the workflow first to see if it there are conditions on this Catalog Task that lead to another Catalog Task with the same name.  There shouldn't be very many Business Rules on the sc_task table so look for ones with an sc_task GlideRecord in the advanced script or a script include called by the Business Rule as this is what would be needed to create a new sc_task record and/or change the State of another record.