Kickstart install assigns IP address to all interfaces in Red Hat Enterprise Linux 7

Issue

• We're having trouble installing Red Hat Enterprise Linux 7.1 on a UEFI-enabled server (HP BL460c G9).
• The automated install stops and displays the "spokes" menu, with items 3 (software selection) and 4 (installation source) marked with '[!]'.
• It turns out that both interfaces get assigned the same IP address.
• Due to this, I cannot connect to the installation source (available via HTTP).
• Note that only the first interface (eno49) is physically connected, while the second one (eno50) is not.