Bug or my crooked hands?

Hello All,

I have the following situation:

CREATE TABLE "Contacts" (
"Contact" Serial,
"StuffTheir" Text,
"TheDate" datetime DEFAULT TEXT 'now',
"Subj" Text,
"CustomerId" int4,
"Agent" int4,
"ActionType" int2,
"Done" bool default false not null,
"ExecutionDate" datetime,
"Whom" int4
);

Then I have inserted data from text file and do a query

mdb=> select Contact from Contacts;
Contacts
-----------
-2112563299
-2111287024
-2110307960
-2110004687
-2109773688
-2109611925
-2108616455
...

mdb=> select Contact from Contacts where Contact=-2112563299;
Contacts
-------
(0 rows)

What is this and how to treat it?

Best regards,
Yury ICQ 11831432
mailto:yura(at)vpcit(dot)ru