In some cases, Quantify dashboard with Kanban metrics can be empty or lacking some tickets that are expected to be present.
A possible solution is to check the board's JQL filter for additional fields. The most problematic is status and statusCategory. Also, try to avoid filtering dates. For example, created or resolved.
Please note, these settings vary by the project type and board type. In the example below, we are using a classic software project and Kanban board.
This is how you can check the JQL filter.
1) Open board settings
2) Under general settings you will see the filter and JQL itself. Consider removing additional fields or moving them to the sub-filter.