pg_dump -s dumps data?!

hiu
I have weird situation.
pg 9.1.2, compilet by our own script from source, on 10+ machines.
on fours machines, pg_dump -s <database_name> - dumps with data!:

postgres@machine:~$ pg_dump --verbose  --schema-only dbname > q
...
pg_dump: creating TABLE x1
pg_dump: restoring data for table "x2"
pg_dump: dumping contents of table x2
pg_dump: restoring data for table "x3"
pg_dump: dumping contents of table x3
...

What could be wrong?

Same pg_dump call on the same host, but for different database dumps just schema!?

Best regards,

depesz

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