Epic Issues and respective child issues not showing in board

[Davide Astarita]

I created a Team-managed project, and on the board I can't see epic issues and respective child issues.

My Epic flag in card detail is already off.

Also if I group issues by Epic, the child issue of my Epic is not showed on the board.

I can see my issues in the Backlog and in my timeline.

How can I fix?