School assignment in C. Sort random numbers, not workning

I go web development in school and we learn the basics of C. What I share now is part of a larger task. This part is; make random numbers between 100-900, print them in a matrix 10x10 and then sort the numbers in the matrix.

I get random numbers. And numbers are sorted. But not the right numbers. It sort completely new numbers why...

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

void slumptal(int slumpArray[]);
void printArray(int slumpArray[]);
void sortera(int sortArray[]);
void printsort(int sortArray[]);

/*Main, där programmet initieras */
int main(void)
{
    int array[100];
    srand(time(NULL)); //seed
    slumptal(array);
    printArray(array);
    sortera(array);
    printsort(array);
    return 0;
}

/* Funktion som slumpar tal och sparar i array..Random numbers stored in a array*/
void slumptal(int slumpArray[])
{
    for (int x = 0; x < 100; x++)
    {
        slumpArray[x] = rand() % 801 + 101;
    }
}

/*Funktion som skriver ut matrisen.. Print the matrix*/
void printArray(int slumpArray[])
{
    printf("\n");
    for (int x = 1; x < 10; x++)
    {
        for (int y = 1; y < 10; y++)
        {
            printf("%4d", slumpArray[x * 10 + y]);
        }
        printf("\n");
    }
}

/*Funktion som sorterar elementen i matrisen. Sort element in the matrix */
void sortera(int sortArray[])
{
    for (int i = 0; i < 101; i++)
        for (int j = 100; j > i; j--)
            if (sortArray[j - 1] > sortArray[j])
            {
                int slask = sortArray[j - 1];
                sortArray[j - 1] = sortArray[j];
                sortArray[j] = slask;
            }
    
}

/*Funktion som skriver ut sorteringen. Print the sorted numbers */
void printsort(int sortArray[])
{
    printf("\n");
    for (int i = 0; i < 101; i++)
    {
        printf("%4d", sortArray[i]);
    }
}