Odd printf behavior?

I just compiled the program below in Cyqwin and on codepad

int main()
{
int k=1;
printf("%d, %d, %d\n", k, k++, k++);
}

In both cases the output was

3, 2, 1

Shouldn't it be the other way around?

Any thoughts would be welcome.
:)

Read my answer here -> Comma Operator - C And C++ | Dream.In.Code

Then understand that the code has undefined behaviour.