Athena Iceberg does not delete orphan files

I have Athena Iceberg table. The table has 2 partitions.

Each hour I update it with MERGE and DELETE commands.

SELECT count(*) FROM "my_table$files"

now gives 16. Meanwhile data folder contains 158 files.

None of

VACUUM  my_table

or

OPTIMIZE my_table REWRITE DATA USING BIN_PACK

Is not helping to remove unnecessary files.

Table has following TBLPROPERTIES

TBLPROPERTIES (
  'table_type'='iceberg',
  'vacuum_max_snapshot_age_seconds'='60',
  'write_compression'='ZSTD',
  'format'='parquet',
  'vacuum_max_metadata_files_to_keep'='2',
  'optimize_rewrite_delete_file_threshold'='2',
  'optimize_rewrite_data_file_threshold'='2'
)

It is that aggressive because I do not need any history of changes. I'm interested in the latest state only.

Number of files is keep growing and never decrease, the spite the fact that the number of rows in the table is almost constant.

What I'm doing wrong, and how to stop files inflation.