wrong value returned?

Hi,

I've setup a query in my program to get the biggest value used in my "customers" table. There is a serial column called customer_id. I use the following query within my program and it returns, lets say, 3. If I run the same query from the psql console window (over and over and at the same point where I've stepped to in my program), it will consistently return 2 whereas the program will consistently return 3 (always one more).

Here is the query to get the last ID used:
SELECT customer_id from customers order by customer_id DESC limit 1;

I do one fetch and have my result programmatically which is always 1 more than the value returned by the psql console window method. What gives?

Many thanks,
Mike