Back to code output bug?

hello i’m using something like :

 boolean go(int x, int y){
        System.err.println("go: " + x + " " + y);
        System.out.println(x + " " + y);
        return (...)
}

but the console output gives me things like :

> go: 23 3
Standard output stream :
> 23 5
Game information :
ME stayed on cell 23,5 

any idea ?

Can happend if you have another println statement

thanks, figured that in some part of code i was getting go(…) called twice.