Repmgr : It automatically promotes to new master but other standby stopped

I'm trying to setup postgre with repmgr and here is the rsult The scenario is, 1. i tried to spinup 1 primary and 2 standby. 2. then i stop the primary so the postgres-2 got promoted. 3. Unfortunately the postgres-3 got disconnected due to some reason but here is the error log It looks like it was able to connect but the postgres restared and didn't come back. 4. I spin up another standby but the master it was pointing is the old one which is postgres-1 That might be the reason why it is saying !running and still primary even if the actual primary is postgres-2. My question is how can i make other standby not disconnected every time i promoted (automatically due to failure etc.) a new primary? here is my repmgr.conf

NET_IF=netstat -rn | awk '/^0.0.0.0/ {thif=substr($0,74,10); print thif;} /^default.*UG/ {thif=substr($0,65,10); print thif;}'
NET_IP=ifconfig ${NET_IF} | grep -Eo 'inet (addr:)?([0-9]*\.){3}[0-9]*' | grep -Eo '([0-9]*\.){3}[0-9]*' | grep -v '127.0.0.1' 

HOSTNAME='postgres-'${my_node}

cat /etc/repmgr.conf
	node_id=${my_node}
	node_name=$HOSTNAME
	conninfo='host=${NET_IP} user=repmgr password=repmgr dbname=repmgr connect_timeout=2'
	data_directory='${PGDATA}'

	log_level=INFO
	log_facility=STDERR
	log_status_interval=300
	
	pg_bindir='/usr/lib/postgresql/10/bin'
	use_replication_slots=1
	
	failover=automatic
	promote_command='repmgr standby promote'
	follow_command='repmgr standby follow -W'
EOF

Also, I'm running using docker extending the official postgres docker image

FROM postgres:10

RUN echo "deb http://apt.postgresql.org/pub/repos/apt/  stretch-pgdg main 10" \
          >> /etc/apt/sources.list.d/pgdg.list

# RUN ln -s /home/postgres/repmgr.conf /etc/repmgr.conf

RUN apt-get update && apt-get install wget -y
RUN apt-get install net-tools -y
RUN apt-get update; apt-get install -y git make postgresql-server-dev-10 libpq-dev postgresql-10-repmgr repmgr-common

#RUN wget -c https://repmgr.org/download/repmgr-5.1.tar.gz  -O - | tar -xz

RUN touch /etc/repmgr.conf; \
    chown postgres:postgres /etc/repmgr.conf

ENV PRIMARY_NAME=localhost
ENV REPMGR_USER=repmgr
ENV REPMGR_DB=repmgr
ENV REPMGR_PASSWORD=repmgr

COPY postgresql.replication.conf /tmp/postgresql.replication.conf

COPY scripts/*.sh /docker-entrypoint-initdb.d/

Lastly, here is how i check if should be register as primary or standby

PGHOST=${PRIMARY_NAME}

installed=$(psql -qAt -h ${PGHOST} repmgr -c "SELECT 1 FROM pg_tables WHERE tablename='nodes'")

if [ "${installed}" != "1" ]; then
    echo "Registering as PRIMARY SERVER"
    repmgr primary register
else
    my_node=$(grep node_id /etc/repmgr.conf | cut -d= -f 2)
    is_reg=$(psql -qAt -h ${PGHOST} repmgr -c "SELECT 1 FROM repmgr.nodes WHERE node_id=${my_node}")

    if [ "${is_reg}" != "1" ] && [ ${my_node} -gt 1 ]; then
        echo "Registering as STANDBY SERVER"

        pg_ctl -D ${PGDATA} stop -m fast
        rm -Rf ${PGDATA}/*
        repmgr -h ${PRIMARY_NAME} -d repmgr standby clone --fast-checkpoint
        pg_ctl -D ${PGDATA} start &
        sleep 1
        repmgr -h ${PRIMARY_NAME} -d repmgr standby register    
    fi
fi

here is my update for the postgres.conf

sed -i "s/#*\(shared_preload_libraries\).*/\1='repmgr'/;" ${PGDATA}/postgresql.conf
sed -i "s/#port = 5432/port = 5432/g" ${PGDATA}/postgresql.conf
sed -i "s/#max_wal_senders/max_wal_senders/g"  ${PGDATA}/postgresql.conf
sed -i "s/#wal_level/wal_level/g"  ${PGDATA}/postgresql.conf
sed -i "s/#max_replication_slots/max_replication_slots/g"  ${PGDATA}/postgresql.conf
sed -i "s/#hot_standby/hot_standby/g"  ${PGDATA}/postgresql.conf

sed -i "s/#archive_mode = off/archive_mode = on/g"  ${PGDATA}/postgresql.conf

echo "archive_command = '/bin/true'" >>  ${PGDATA}/postgresql.conf

I'm using postgres:10 and repmgr-5.0 hope someone could help me on this. Thanks,