Boards uses a taxonomy template that might not immediately fit your theme. Because themes use different markup for their templates, it’s not always possible to get the board taxonomy to lay out correctly.
To fix this, you can update the wrappers used in the taxonomy markup by following the guidance on this page for archive (not single) templates.
You should be able to see what the wrappers should be by looking at your theme’s page.php file. However, if you would like any help on this, please contact us.