fix: number format not being applied properly

[HardeepAsrani]

Summary

Fixes an issue investigated during support day that doesn't apply formatting to all the items of the charts.

Will affect visual aspect of the product

YES/NO

Screenshots

Test instructions

• Follow the steps laid here on the HS ticket: https://secure.helpscout.net/conversation/3035307261/470340?viewId=212385
• Make sure the format is applied correctly to all the items.
• Also try with different charts to confirm.

Check before Pull Request is ready:

• I have written a test and included it in this PR
• I have run all tests and they pass
• The code passes when running the PHP CodeSniffer
• Code meets WordPress Coding Standards for PHP, HTML, CSS and JS
• Security and Sanitization requirements have been followed
• I have assigned a reviewer or two to review this PR (if you're not sure who to assign, we can do this step for you)

Closes #1221.

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