On the Board settings page, under columns, the column 'In Progress' says 13 issues. when you view the board, it only shows 1.
I also checked the filter for the board and it has 13 issues 'In Progress'.
Could this be an issue with the workflow? I noticed on the board filter, when I filter on 'Resolution' and select 'Un-Resolved', issues that have a status of 'In-Progress are not showing.