BUG? - Sequence got verry strange id

"Miguel Carvalho" <miguel@ipatimup.pt> writes:

I, does any one know about any issue related to sequences generating
duplicat id's in Postgresql 7.1.2?

There are a couple of recently-identified bugs that could cause a
sequence to roll back a few counts after a crash. 7.2.1 (due out
as soon as Marc wraps a tarball) contains fixes.

regards, tom lane