Copy and paste from "known issues" :

The issue below has been confirmed.
We are currently investigating and working to address this issue.

[Known Issue]

■The daily Omicron tribal quests listed below may appear with a green icon even though they have not been completed.

Well Below Standard / A Fertile Blend / Using Their Heads

*This is only a display issue and the quests can be completed by fulfilling the objectives.

We sincerely apologise for any inconvenience this may cause.