Odd messages on reloading DB table

With PostgreSQL 9.5.15, I ran:

    pg_dump -t targets -d atst.experimentdb >nT.db

then I ran:

    psql -h langley atst.experimentdb <nT.db

and got:

    SET
    SET
    SET
    SET
     set_config
    ------------

    (1 row)

    SET
    SET
    SET
    SET
    SET
    ERROR:  relation "targets" already exists
    ALTER TABLE
    ERROR:  relation "targets" does not exist
    LINE 1: UPDATE targets SET             time_stamp=new.time_stamp,   ...
                ^
    QUERY:  UPDATE targets SET             time_stamp=new.time_stamp,            modified=new.modified, 
id=new.id,            targets=new.targets     WHERE (id=new.id)
    CONTEXT:  PL/pgSQL function public.targets_insert_or_update() line 1 at SQL statement
    COPY targets, line 1: "2017-10-31 09:37:28.798152    t    az_el_target     
{"name":"AZ_EL_Targets","priority":10,"tags":["{\\"Tag.tag..."
    ERROR:  relation "id_id_targets" already exists
    ERROR:  relation "time_stamp_id_targets" already exists
    ERROR:  trigger "targets_trigger_insert" for relation "targets" already exists
ERROR:  trigger "targets_trigger_update" for relation "targets" already exists
REVOKE
REVOKE
GRANT
GRANT

Eh?  It looks like it worked (maybe), but why:

    (1) the table already exist and the immediately doesn't exist?
    (2) report ERROR on UPDATE when there are no UPDATES in the input file?

I see similar errors when using -Fc on the dump and pg_restore to read it back in,
    except, I use "-a" on both pg_dump and pg_restore so the error about the
    table already exising goes away [no CREATE TABLE anymore, of course).

Can someone explain what happened and how it can be fixed?

For reference, here are the first few lines of nT.db:
=====================================================
--
-- PostgreSQL database dump
--

-- Dumped from database version 9.5.15
-- Dumped by pg_dump version 9.5.15

SET statement_timeout = 0;
SET lock_timeout = 0;
SET client_encoding = 'SQL_ASCII';
SET standard_conforming_strings = on;
SELECT pg_catalog.set_config('search_path', '', false);
SET check_function_bodies = false;
SET client_min_messages = warning;
SET row_security = off;

SET default_tablespace = '';

SET default_with_oids = false;

--
-- Name: targets; Type: TABLE; Schema: public; Owner: atst
--

CREATE TABLE public.targets (
     time_stamp timestamp without time zone NOT NULL,
     modified boolean DEFAULT false,
     id character varying(256) NOT NULL,
     targets text,
     marked boolean DEFAULT true,
     collectable boolean DEFAULT false,
     proposalid text
);


ALTER TABLE public.targets OWNER TO atst;

--
-- Data for Name: targets; Type: TABLE DATA; Schema: public; Owner: atst
--

COPY public.targets (time_stamp, modified, id, targets, marked, collectable, proposalid) FROM stdin;
=======================================================================
-- 
Steve Wampler -- swampler@nso.edu
The gods that smiled on your birth are now laughing out loud.