It seems like something might be off with the installation. Ensure the datapack is correctly installed and enabled on your server. Double-check that the file structure within the 'datapacks' folder is correct, and make sure you're using version-compatible files.
If everything seems correct and it's still not working, it could be beneficial to re-download and reinstall the files to ensure there wasn't corruption during the download process.
If the issue persists, reaching out to a support helper might be your best option.