Why did Wuxi deduct social security money twice?

The reason why the social security fees were deducted twice was that the second time was probably to make up the difference in social security fees. You can ask the relevant staff for details.

General social security is withheld by banks. If you deduct the fee twice a month, you can go to the bank to consult and check the bill. If you deduct it twice, you can definitely return it. You can also go to the social security bureau to ask for confirmation. This is more accurate and more conducive to safeguarding their rights and interests.

The social security policy is that the payment can be filled for up to two years, that is to say, it is calculated according to the time period of payment, not the cumulative month, starting from the month of payment.