Some images disappearing from Google Cloud

I used WP Stateless to move our old images to Google Cloud Storage but it looks like the images are disappearing from the Google Cloud Storage. Not all, but random uploads are gone. I can’t pinpoint what is causing this or why this is happening. On the website I get a Access Denied error but when I log-in to Google Cloud the file that used to be there is not there anymore.

I use the standard settings in Google Cloud, no data expiry.

The page I need help with: [log in to see the link]