Hi there and welcome to the Atlassian Community!
There can be several reasons for this.
First make sure that your board filter (and sub-filter) contain the issues you are trying to visualise on the board.
If that checks out on the board view you need the status your issues are in mapped to a column (green arrow in the screenshot).
If you have mapped the status to the Kanban Backlog, these issues don't show on the board, but rather on the Backlog view (red arrow in the screenshot).
Good luck!
Jeroen
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