the two entries named "cephfs" are referencing the same thing. one is on the Ceph level, where a cephfs called "cephfs" exists. the other is on the PVE level, where a storage of type "cephfs" called "cephfs" exists, which uses the cephfs called "cephfs".
you could also call your cephfs or your storage differently, but that doesn't really make it less confusing, a 1:1 mapping of storage name and underlying pool/cephfs/.. name is what is usually used.