gpg --list-keys command outputs uid [ unknown ] after importing private key into a clean install

I did a clean install of Arch Linux and imported my backed up gpg private key. As a sanity check I ran: gpg --list-keys Everything showed up as normal except for the uid which now reads: uid [ unknown ] User When I first created this key before the clean install it read: uid [ ultimate ] User Why would it change from [ ultimate ] to [ unknown ]after importing it onto a clean install?