"cout" chaining while performing increment and decrement produces unexpected result

Question

The following program includes simply increment and decrement operations. As my prediction the program should print "0 1 1 1" but it is printing "1 0 2 0" instead,but why?

#include<iostream>
using namespace std;
int main(void)
{
    int i=0;
    cout<<i++<<" "<<i++<<" "<<--i<<" "<<i++;//this will print "1 0 2 0"
}

...but it works fine if I don't chain the output command like,

cout<<i++<<endl;
cout<<i++<<endl;
cout<<--i<<endl;
cout<<i++<<endl;

Even if they should work in the same way but they are producing different results. But why?