Go to the E_GuildPermission there you can change the guild permissions names.

Then go to the BP_CGGGameState and in the class defaults check that in the Starting Roles inside there Permissions arrays none of the entries are set to E_MAX, if any do you will need to set it back to the permission setting it should be. This can happen after renaming an entry on an enum.

Note changing the names may break any previous guild saves so I suggest dragging the BP_SaveHelper into a level then in the details panel click the CGG Delete Save button.