Table widget does not display content properly when using columns keys that are numbers or start with a number.
Linux Debian Buster 10, OpenJDK 11
Import the provided page or create a page with a table widget and define columns keys as a list of number (e.g.: 1, 0) or name that start with number (e.g.: 0col, 1col).
See initial report of the issue on the community website: https://community.bonitasoft.com/questions-and-answers/how-fix-issue-displaying-data-sets-numeric-headers-using-widget-table-same
Use a different type of keys.