It appears yo9ur custom role included other roles, so when you removed the custom role, those inherited roles were also removed from the admin user. The roles should still be there. You can add each manually or add another role or group which includes those roles. If you have that same role in another instance where it has not been deleted, you may be able to view the included roles there to determine what was removed. Otherwise if you must determine that list of roles, you would need ServiceNow Support to restore a backup of your instance into a temp instance so you can recover the definition of the role you deleted.
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