Steve Peterson <stevep-hv@zpfe.com> writes:
> The behavior also persists across a dump/reload of the table into a
> new install on a different machine. IIRC dump/reload rebuilds
> indexes from scratch.
Hm. There must be something you're not telling us that accounts for
the difference between the original table and the copied version ---
foreign keys linking from other tables, perhaps?
regards, tom lane