Maxadmin list servers gives a negative for the number of connections

When executing the maxadmin command it shows a negative value after some time of running the maxscale(2 hours or more).

[root@SAN1 ~]# maxadmin list servers
Servers.
--------------------------------------------------------------------
Server | Address | Port | Connections | Status
--------------------------------------------------------------------
server1 | 10.0.0.215 | 3306 | -3 | Master, Running
server2 | 10.0.0.212 | 3306 | -3 | Slave, Running
server3 | 10.0.0.4 | 3306 | -3 | Slave, Running
server4 | 10.0.0.20 | 1975 | -3 | Slave, Running
--------------------------------------------------------------------

Restarting maxscale will resolve this issue.