Popularity trends NOT displaying any data on certain sites

Hi,

I'm using SP 2013 on premise.

Certain areas of my site are not displaying any popularity trend data.

For example i have a relatively new blog site (e.g. companyintranet.co.uk/blog-site), which doesnt show any data either under "Popularity trends" or "Popular items" for that list.

I have checked the site collection admin, and reporting is turned ON. I have also checked the central admin settings for health data and usage, and all the required settings are checked.

Any ideas?

Thanks