Logs are added in old rotated file instead of new file

Question

Below is my log4j2.xml file:

<?xml version="1.0" encoding="UTF-8"?>
<Configuration xmln="http //logging.apache.org/log4j/2.0/config">
  <Appenders>
    <RollingFile name="File" fileName="${path}/server.log"
                 filePattern="${path}/server.log.%d{yyyy-MM-dd-HH}-%i">
      <PatternLayout>
        <Pattern>%d %p %c [%t] %m%n</Pattern>
      </PatternLayout>
      <Policies>
        <SizeBasedTriggeringPolicy size="1 MB"/>
      </Policies>
      <DefaultRolloverStrategy fileIndex="nomax" />
    </RollingFile>
  </Appenders>
  
      <RollingFile name="ExceptionLogs" fileName="${path}/ExceptionLogs.log"
                 filePattern="${path}/ExceptionLogs.log.%d{yyyy-MM-dd-HH}-%i">
      <PatternLayout>
        <Pattern>%d %p %c [%t] %m%n</Pattern>
      </PatternLayout>
      <Policies>
        <SizeBasedTriggeringPolicy size="1 MB"/>
      </Policies>
      <DefaultRolloverStrategy fileIndex="nomax" />
    </RollingFile>
  </Appenders>
  
  <Loggers>
    <Logger name="com.x.aop.exception">
        <AppenderRef ref="ExceptionLogs"/>
    </Logger>
    
    <Root level="ERROR">
      <AppenderRef ref="File"/>
    </Root>
  </Loggers>
</Configuration>

Let's say my server started at 3:00 PM and I have 5 log files

1. server.log
2. server.log.2022-01-19-15-1 (1 MB)
3. server.log.2022-01-19-15-2 (1 MB)
4. server.log.2022-01-19-15-3 (1 MB)
5. server.log.2022-01-19-15-4 (1 MB)
6. server.log.2022-01-19-15-5 (1 MB)

Some time it will add in older file created (like server.log.2022-01-19-15-2, server.log.2022-01-19-15-1) instead of latest file

Why logs are added in already rotated file instead of latest highest number log file?