"Böhm, Sebastian (Vendor)" <sebastian.boehm@friendscout24.de> writes:
> This happend to 0.3% of all rows in this table, after dump/import exactly
> the same rows were affected.
So you can reproduce the problem after dumping/reloading? If you could
send me the dump file (off-list!) I'd be willing to investigate here ...
regards, tom lane