Invalid warnings from monitoring plugin are flooding the logs

Openfire Plugins
1

Hello, i’ve set up a new Openfire 4.6.6 / monitoring plugin 2.2.2-Snapshot (from 5.1.22).
I have much warnings in the logs like:

2022.01.19 06:55:45 WARN  [pool-monitoring3993]: org.jivesoftware.openfire.reporting.stats.StatsEngine - Sample time of 1642571700 for statistic proxyTransferRate is invalid.
2022.01.19 06:55:45 WARN  [pool-monitoring3993]: org.jivesoftware.openfire.reporting.stats.StatsEngine - Sample time of 1642571700 for statistic conversations is invalid.
2022.01.19 06:55:45 WARN  [pool-monitoring3993]: org.jivesoftware.openfire.reporting.stats.StatsEngine - Sample time of 1642571700 for statistic muc_outgoing is invalid.
2022.01.19 06:55:45 WARN  [pool-monitoring3993]: org.jivesoftware.openfire.reporting.stats.StatsEngine - Sample time of 1642571700 for statistic packet_count is invalid.
2022.01.19 06:55:45 WARN  [pool-monitoring3993]: org.jivesoftware.openfire.reporting.stats.StatsEngine - Sample time of 1642571700 for statistic muc_incoming is invalid.
2022.01.19 06:55:45 WARN  [pool-monitoring3993]: org.jivesoftware.openfire.reporting.stats.StatsEngine - Sample time of 1642571700 for statistic muc_rooms is invalid.
2022.01.19 06:55:45 WARN  [pool-monitoring3993]: org.jivesoftware.openfire.reporting.stats.StatsEngine - Sample time of 1642571700 for statistic server_sessions is invalid.
2022.01.19 06:55:45 WARN  [pool-monitoring3993]: org.jivesoftware.openfire.reporting.stats.StatsEngine - Sample time of 1642571700 for statistic muc_users is invalid.
2022.01.19 06:56:45 WARN  [pool-monitoring3993]: org.jivesoftware.openfire.reporting.stats.StatsEngine - Sample time of 1642571760 for statistic sessions is invalid.
2022.01.19 06:56:45 WARN  [pool-monitoring3993]: org.jivesoftware.openfire.reporting.stats.StatsEngine - Sample time of 1642571760 for statistic server_bytes_out is invalid.
2022.01.19 06:56:45 WARN  [pool-monitoring3993]: org.jivesoftware.openfire.reporting.stats.StatsEngine - Sample time of 1642571760 for statistic muc_occupants is invalid.
2022.01.19 06:56:45 WARN  [pool-monitoring3993]: org.jivesoftware.openfire.reporting.stats.StatsEngine - Sample time of 1642571760 for statistic server_bytes_in is invalid.

What is the issue of theese warnings?
How can i fix them?