Charts in Blippit Boards are powered entirely by tags. If a board is not tagged, it will not appear in the relevant chart or in filtered reports, even if the content clearly relates to that area.
In summary:
Also see how a school Admin can remove tag categories for all users in one go via the Dashboard Whole School Settings
You can:
(Older help articles may show a previous design, but the tagging process is essentially the same.)

Tagging ensures that:
Without tags, moments exist, but they remain undiscoverable to others.

As a bare minimum, we recommend every board is tagged with at least
Teachers may also add:
The more relevant tags added, the more meaningful your charts and reports become.
More detailed and accurate tagging leads to:
Admins and Subject Leaders can, where appropriate, edit colleagues’ boards to improve or complete tagging so that the data reflects reality.
Example:

Tags can be added or edited at any time, but best practice is to:
If tagging is left until later, boards may be overlooked, which can misrepresent subjects or themes in charts and reports.
This applies to every tag and every chart: a board will only appear in a chart or report if the relevant tag has been applied. For example: