Hap ac3 upgrade firmware

RouterOS General
1

Hi
I have successfully upgrade my hap ac3 to 7.11.
after upgrade the firmware and reboot, it display “!” in “current firmware”.
what is the “!” means in current firmware?

routerboard: yes
      board-name: hAP ac^3
      model: RBD53iG-5HacD2HnD
      serial-number: HCQ08B7CG2G
      firmware-type: ipq4000
      factory-firmware: 7.2.3
      current-firmware: 7.11!
      upgrade-firmware: 7.11