I cannot find direct information from current resources about the specific reasons for the increase in margin on AliExpress. Generally speaking, the increase in margin may be related to the platform's policy adjustments, market changes, risk management strategies or other operational considerations. In order to obtain the most accurate information, it is recommended that you contact AliExpress's official customer service directly or visit its official website to learn about the latest margin rules and detailed reasons for any policy changes.

At the same time, if you have any questions about the payment, management or refund of the margin, you can also consult AliExpress's customer service, who can provide professional guidance and assistance. Margin is a mechanism used by AliExpress to ensure transaction security and integrity. Correctly understanding and complying with relevant rules is essential for successful operation on the platform.