The subject of social security payment is inconsistent with the subject of labor.

Legal analysis: the inconsistency between the subject of labor contract signing and the subject of social security payment only occurs under the specific circumstances of labor dispatch. According to Article 19 of the Interim Provisions on Labor Dispatch, if a labor dispatch unit sets up a branch in the place where the employing unit is located, the branch shall go through the insurance formalities for the dispatched workers and pay social insurance premiums.

Legal basis: Article 58 of the Social Insurance Law of People's Republic of China (PRC) stipulates that the employer shall apply to the social insurance agency for social insurance registration for employees within 30 days from the date of employment. If the social insurance has not been registered, the social insurance agency shall verify the social insurance premium it should pay. Employees-free individual industrial and commercial households who voluntarily participate in social insurance, part-time employees who do not participate in social insurance in the employing unit and other flexible employees shall apply to the social insurance agency for social insurance registration.