Pricing Image Resizing Requests

My nextjs-on-pages project is using R2 to store images and Image Resizing urls to serve images. The resized image responses have the following headers. But my project is showing a lot of Image Resizing requests under the billable usage panel - around 3 million requests month to date with around 30k original R2 images being resized.

Cache-Control:public, max-age=31536000, immutable
Cf-Cache-Status:HIT


Are these requests billable as per $9 every 50k requests? Confused if I did anything wrong with the setup, as I would expect these to be non-billable requests as the images should be cached for all resized images
Screenshot_2023-11-21_at_3.49.53_AM.png
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