The dual-system hot standby networking environment is as shown in the following figure: VRRP group 1 and 2 are added to the VGMP management group, USG_A is the master device, and USG_B is the standby device. When the USG_A has a fault Status, such as power failure, the USG_B status is switched from Slave to Master. After the USG_A is faulty, its status is switched back to Master and the USG_B status is still Master. What is the reason for this now?
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