Hi
I ve noticed the same on my VC EX4550 running Junos 15.1R5.5.
Mon Jan 29 02:02:42 2018 vlan_name dedyki2 mac d2:0b:4f:d5:16:0e was deleted on ae11.0
Mon Jan 29 02:02:52 2018 vlan_name dedyki2 mac d2:0b:4f:d5:16:0e was learned on ae11.0
Mon Jan 29 02:02:52 2018 vlan_name dedyki2 mac d2:0b:4f:d5:16:0e was deleted on ae11.0
Mon Jan 29 02:03:01 2018 vlan_name dedyki2 mac d2:0b:4f:d5:16:0e was learned on ae11.0
Mon Jan 29 02:03:01 2018 vlan_name dedyki2 mac d2:0b:4f:d5:16:0e was deleted on ae11.0
Mon Jan 29 02:03:03 2018 vlan_name dedyki2 mac d2:0b:4f:d5:16:0e was learned on ae11.0
Mon Jan 29 02:03:03 2018 vlan_name dedyki2 mac d2:0b:4f:d5:16:0e was deleted on ae11.0
Mon Jan 29 02:03:12 2018 vlan_name dedyki2 mac d2:0b:4f:d5:16:0e was learned on ae11.0
Mon Jan 29 02:03:12 2018 vlan_name dedyki2 mac d2:0b:4f:d5:16:0e was deleted on ae11.0
Mon Jan 29 02:03:22 2018 vlan_name dedyki2 mac d2:0b:4f:d5:16:0e was learned on ae11.0
Mon Jan 29 02:03:22 2018 vlan_name dedyki2 mac d2:0b:4f:d5:16:0e was deleted on ae11.0
Mon Jan 29 02:03:32 2018 vlan_name dedyki2 mac d2:0b:4f:d5:16:0e was learned on ae11.0
Mon Jan 29 02:03:32 2018 vlan_name dedyki2 mac d2:0b:4f:d5:16:0e was deleted on ae11.0
Mon Jan 29 02:03:42 2018 vlan_name dedyki2 mac d2:0b:4f:d5:16:0e was learned on ae11.0