Go to vcenter server settings>advanced settings and look for config.vpxd.filter.hostRescanFilter and see if it is set to true. This disables automatic rescans when adding storage. When i have a lot fo luns to add I use this, add to one host, then perform a manual rescan. Maybe someone turned this on for the new environment.
If you right click the cluster and click "rescan for datastores" do they now appear on your other hosts?