Hi,
Yes, your zip archive has a central directory name that does not match the file name. This is a bug in how the epub was zipped up. It is actuyalloy a security issue but no one at Adobe seems to be interested in properly fixing it. This has nothing to do with DRM itself so I don't feel bad explaining.
Simply unzip it, fix the name of the file manually (to match its opf file name) if necessary, and ****properly**** re-zip it. My guess is you are simply not re-zipping it back up properly
The key to properly re-zipping it is to add the files to the zip archive in the proper order, without compression for some files, and obviously in the proper directories. You can find directions via Google how to do this by hand on the web.
There are tools available to make this easy for both Mac and Windows users.
On Windows - a simple google search gives me the following link. I have never tried it but it should work and if not, the author should be able to help.
https://www.mobileread.com/forums/showthread.php?t=84675
On Mac's - a simple google search gives me the following and I have used this on my Mac OS X and it works wonderfully!
https://www.mobileread.com/forums/showthread.php?t=55681
There are ways to do with with the command line unzip program by turning on the repair option for users of Linux.
Something here should properly fix the zip archive.