Content in Text boxes in Excel Online disappeared

Hi,

I have developed a dashboard in Excel Desktop. I've used Text boxes as cards. I have shared the workbook via Teams so that users can consume the dashboard in Excel Online. This have worked well for 3 months. After refreshing the underlying data model in Excel Desktop this week, the content in some (not all) of the text boxes has suddenly disappeared in the Online version.

The desktop workbook and online version are synced via Sharepoint (all changes are done in the desktop version, when needed).

How can I fix this problem?

Thanks!