Maybe the module has been (incorrectly) installed local to the root user instead of system-wide? I installed a fresh CentOS 7 VM just a few days ago that seemed to have an SElinux problem that prevented CPAN from installing modules system-wide. That problem went away after setting SElinux to "permissive", which I had to do anyway because... reasons.

One of the reasons being that I always find SElinux to be a royal pain in the STDOUT.