Hello,
Thank you for contacting Rank Math and sorry for any inconvenience caused.
Please check if cron jobs are working on your website or not, you can follow this guide to check that: https://rankmath.com/kb/analytics-issues/#num-2-check-the-cron-job
In order to fetch the data correctly and consistently, you need to have the cron jobs working and enabled in your installation.
If the cron jobs are working, please head over to your WordPress dashboard > Tools > Scheduled Actions > Pending, and check if there is a pending Scheduled Action:
https://yourdomain.com/wp-admin/tools?page=action-scheduler&status=pending
Run the rank_math/analytics/data_fetch scheduled action and wait for the data fetch to complete.

You can check the progress at Rank Math > Analytics.
Let us know if the issue persists.
We are here to help you.
cron jobs were working fine on the website
deleting and re-fetching data has worked so far.
Hello,
We are glad the issue is resolved.
If you have any questions in the future, please feel free to create a new forum topic, and it will be our pleasure to assist you again.
Thank you.