Hello,
Thank you for contacting us and we regret the inconvenience caused.
Please check if cron jobs are working on your website or not, you can use the WP-Crontrol plugin to check that.
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, check if there is a pending Scheduled Action, head over to your WordPress dashboard > Tools > Scheduled Actions > Pending:
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.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.