Attachment downloads requires visitor to login, even though they are set to public?

Attachment downloads requires visitor to login, even though they are set to public?

Hi

On this page - https://bhi-ltd.com/products/noise-cancellation-products/pcb-modules-low-level-audio/73-nedsp900.html - we have attachments on the download tab at bottom of the page. The attachments are set to public but the website is asking people to login to download. Why is this happening?