System reaches start level 100 twice

[dilyanpalauzov]

I have this rule

rule "System started"
when
    System reached start level 100
then
  logDebug('l', 'System reached start level 100')
end

I stop OpenHAB 4.2.2, then start openhab. I expect, that OpenHAB will eventually print "System reached start level 100” once.

But usually it prints it twice with a delay of approximately 30 seconds.