How do can I get rid of the blank lines that are created c++?

I have come to ask for help as my professor is not giving me the help I need. I am new to c++ and I am trying to program a program that displays all the integers from 1 to 100 that are divisible by 6 or 7, but not both. and I have to display 5 numbers per row. I got it working except I have blank lines forming in certain areas. I don't know if it's because of how I set up the counter or what.

Here is what I got.

#include <iostream>

using namespace std;

int main()
{
    int counter = 0; // Counter for creating new lines after 5 numbers
    for (int numRange = 1; numRange <= 100; ++numRange) // Starts the loop of number 1 to 100
    {
        if (numRange % 6 == 0 || numRange % 7 == 0) // Makes the numbers divisible by 6 and 7
        {
            cout << numRange << " "; // Displays the output of the divisible numbers
            counter++; // Starts the counter

        }
        if (counter % 5 == 0) // using the counter to create new lines after 5 numbers displayed
        {
            cout << endl; // Creates a new line
        }
    }

    return 0;
}

This is what is outputted:

6 7 12 14 18


21 24 28 30 35
36 42 48 49 54

56 60 63 66 70

72 77 78 84 90
91 96 98

and this is what it's supposed to look like

  6   7 12 14 18 
21 24 28 30 35 
36 48 49 54 56 
60 63 66 70 72 
77 78 90 91 96 
98