what is the problem in my star pyramid pattern?

i am creating a star pyramid pattern in c, everything is fine but the star "*" is increasing by 2 where it should be increase by 1. here is my code:

#include<stdio.h>
int main()
{
int i,j,k,n;

printf("Enter the number of rows: ");
scanf("%d", &n);

for(i=1; i<=n; i++)
{
    for(j=1; j<=n-i; j++)
    printf(" ");
    for(k=1; k<=(2*i-1); k++) // here k should increase by 1 but it is increasing by 2
    printf("*");
    printf("\n");
}
return 0;

}

Output is:

Enter the number of rows: 5
    *
   ***
  *****
 *******
*********

as you can see that star is increasing by 2. i don't know why.