Standby Appliance not close connection

Hi community, today i find a strange issue.

I've an HA pair appliance, Active - Standby. I've forced Standby the applianceA and the applianceB become Active.

I check the VS statistic of the standby (appliaceA), but after 1days 4vs have 10k of current connections. I've forced the disable status on the VS and the session decrease. If i reactivate the VS, the session grow as previous the disable action. If i check the state of the pool, they are all at 0 current connection.

The active appliance process all the traffic correctly and no disservice occur. I've 10.2 version and the external interface is on internet.

What could be the issue? Why if it is standby the session grow?

Thanks! -AB