I am using SharePoint Foundation 2013 and I created a DocLibrary with the site collection admin account. I added a .docx file directly in it, but all the users (all in the same SharePoint group) that have only the Read permissions do not see the file. If I switch their permissions on this library to anything else (Edit, Contribute, etc.) they can see the file. The permissions on the document are inherited from the library.
Also, I did not change anything in the Central Admin Permission Policy.
My question is: why users cannot see documents with Read permissions?