two serial fields within one table?

hi, there,

I use two serial type fields within one table, seems psql does not
like it: it override the first one with the second one! Why? (seems to me
quite often if I do not want to normize it too much) or
something else?

here is the table:

create table tmpschedule
(
schedid serial,
addtime datetime,
eventid serial,
eventaddtime datetime,
poll int
);

thanks in advance!!!

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