Multiple autovacuum: ANALYZE/VACUUM on the same table - postgresql

Question

I am currently using Postgres 11. For some reason whenever I check running autovacuums, I would see several multiple autovacuum: ANALYZE or autovacuum: VACUUM on the same table.
postgres=# SELECT backend_type,
pid,
now() - xact_start AS duration,
query,
state
FROM pg_stat_activity
WHERE query LIKE 'autovacuum%'
ORDER BY duration DESC LIMIT 64;
backend_type | pid | duration | query | state
-------------------+------+-----------------+-------------------------------------------------------------------+--------
autovacuum worker | 5900 | 00:48:29.175656 | autovacuum: ANALYZE someschema.foo | active
autovacuum worker | 3552 | 00:48:18.72438 | autovacuum: ANALYZE someschema.foo | active
autovacuum worker | 6122 | 00:47:29.907655 | autovacuum: VACUUM someschema.foo | active
autovacuum worker | 5897 | 00:42:45.380395 | autovacuum: VACUUM someschema.bar | active
autovacuum worker | 5583 | 00:38:45.406516 | autovacuum: VACUUM someschema.bar | active
The DDL looks like the following:
Table "someschema.foo"
Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
-------------------+------+-----------+----------+---------+----------+--------------+-------------
foo_id | text | | not null | | extended | |
baz_id | text | | | | extended | |
Indexes:
"foo_pkey" PRIMARY KEY, btree (foo_id)
"baz_reference_id_idx" UNIQUE, btree (foo_id, baz_id)
Options: autovacuum_vacuum_cost_limit=2000, autovacuum_vacuum_cost_delay=10
I am unsure what is going on, and I cannot find my answers from the official documentations:
https://www.postgresql.org/docs/11/routine-vacuuming.html#AUTOVACUUM
https://www.postgresql.org/docs/11/sql-analyze.html
max_worker_processes = 15
autovacuum_max_workers = 64