mysql query returns different number of records from coldfusion and navicat

Hi

I'm hoping that someone can suggest a basic strategy to debug this.

I have a fairly large and complicated query that is executed by a function in a cfc.

It returns (for example) 100 rows.

If I use cfdump and then copy and paste the SQL of the query (with the variables, of course) into Navicat and execute exactly the same query on the same mySQL database, it returns 130 rows.

Same SQL string, same database, same data - the only difference is that in one instance Navicat submits the query and in the other, Coldfusion does.

Has anyone ever had anything like this happen before?