Why is router's LAN IP changed?

This is likely because you are using a RobustVPN + Pushed Subnet VPN Group. The subnet is usually 192.168.10.0/28. With this option, the RobustVPN manager can access the devices on the subnet from anywhere.

Please check if your device has Service -> RCMS -> RobustVPN enabled. If you do not want to use the RobustVPN pushed subnet, you can use the Virtual IP only, as shown in the photo below.

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