Does it mean someone is hacking my game server?

But why do you force disconnect my running shard?

[01:51:17]: Received secondary shard info for an already existing shard. Ignored
[01:51:17]: [Shard] Force disconnecting secondary secondary shard with GUID: 4696225437288846924
[01:51:17]: Received secondary shard info for an already existing shard. Ignored
[01:51:17]: [Shard] Force disconnecting secondary secondary shard with GUID: 6427292282440529392
[01:51:17]: Received secondary shard info for an already existing shard. Ignored
[01:51:17]: [Shard] Force disconnecting secondary secondary shard with GUID: 5753974744958838032
[01:51:17]: We lost connection from an unknown secondary shard...
[01:51:17]: Received secondary shard info for an already existing shard. Ignored
[01:51:17]: [Shard] Force disconnecting secondary secondary shard with GUID: 2060795827200521809
[01:51:17]: Received secondary shard info for an already existing shard. Ignored
[01:51:17]: [Shard] Force disconnecting secondary secondary shard with GUID: 5534699494314199321
[01:51:17]: We lost connection from an unknown secondary shard...
[01:51:17]: We lost connection from an unknown secondary shard...
[01:51:17]: Received secondary shard info for an already existing shard. Ignored
[01:51:17]: [Shard] Force disconnecting secondary secondary shard with GUID: 8103790355501983616
[01:51:17]: We lost connection from an unknown secondary shard...
[01:51:17]: Received secondary shard info for an already existing shard. Ignored
[01:51:17]: [Shard] Force disconnecting secondary secondary shard with GUID: 1606137546070241800
[01:51:18]: Received secondary shard info for an already existing shard. Ignored
[01:51:18]: [Shard] Force disconnecting secondary secondary shard with GUID: 3418630607400205963
[01:51:18]: We lost connection from an unknown secondary shard...
[01:51:18]: We lost connection from an unknown secondary shard...
[01:51:18]: We lost connection from an unknown secondary shard...
[01:51:18]: We lost connection from an unknown secondary shard...