cant find mistake in code,code prints without meeting conditions

Code:

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

#define WORDS 10
#define WORDS_LENGHT 10
#define ABC_LENGHT 25

//defines for index in arrays:
#define TWO 2
#define THREE 3
#define FOUR 4
#define FIVE 5
#define SIX 6
#define SEVEN 7
#define EIGHT 8
#define NINE 9
#define TEN 10
#define ELEVEN 11
#define TWELVE 12
#define THREETEEN 13
#define FOURTEEN 14
#define FIVETEEN 15
#define SIXTEEN 16
#define SEVENTEEN 17
#define EIGHTTEEN 18
#define NINETEEN 19
#define TWENTY 20
#define TWENTY_ONE 21
#define TWENTY_TWO 22
#define TWENTY_THREE 23
#define TWENTY_FOUR 24
#define TWENTY_FIVE 25


void welcome_AND_checkInput(char userSentence[][WORDS_LENGHT],int sentence_Counter[]);

int main()
{
    char userSentence[WORDS][WORDS_LENGHT] = {0};
    int sentence_Counter[ABC_LENGHT] = {0};
    welcome_AND_checkInput(userSentence,sentence_Counter);
}
/*
This functions gets user input and checks if all the alphabetic letters have been inputed at least once.
    input:string array - char userSentence[][WORDS_LENGHT],counter array - int sentence_Counter[].
        output:none.
*/
void welcome_AND_checkInput(char userSentence[][WORDS_LENGHT],int sentence_Counter[])
{
    int i = 0;
    int j = 0;
    int k = 0;
    int counter = 0;
    printf("Please Enter Your Sentence:\n");
    for(i = 0; i < WORDS ; i++)
    {
        fgets(userSentence,WORDS_LENGHT,stdin);
      
        for(j = 0 ; j < WORDS_LENGHT ; j++)
        {
            switch (userSentence[j])
            {
                case 'a':
                sentence_Counter[0]++;
                break;
                case 'b':
                sentence_Counter[1]++;
                break;
                case 'c':
                sentence_Counter[TWO]++;
                break;
                case 'd':
                sentence_Counter[THREE]++;
                break;
                case 'e':
                sentence_Counter[FOUR]++;
                break;
                case 'f':
                sentence_Counter[FIVE]++;
                break;
                case 'g':
                sentence_Counter[SIX]++;
                break;
                case 'h':
                sentence_Counter[SEVEN]++;
                break;
                case 'i':
                sentence_Counter[EIGHT]++;
                break;
                case 'j':
                sentence_Counter[NINE]++;
                break;
                case 'k':
                sentence_Counter[TEN]++;
                break;
                case 'm':
                sentence_Counter[ELEVEN]++;
                break;
                case 'n':
                sentence_Counter[TWELVE]++;
                break;
                case 'l':
                sentence_Counter[THREETEEN]++;
                break;
                case 'o':
                sentence_Counter[FOURTEEN]++;
                break;
                case 'p':
                sentence_Counter[FIVETEEN]++;
                break;
                case 'q':
                sentence_Counter[SIXTEEN]++;
                break;
                case 'r':
                sentence_Counter[SEVENTEEN]++;
                break;
                case 's':
                sentence_Counter[EIGHTTEEN]++;
                break;
                case 't':
                sentence_Counter[NINETEEN]++;
                break;
                case 'u':
                sentence_Counter[TWENTY]++;
                break;
                case 'v':
                sentence_Counter[TWENTY_ONE]++;
                break;
                case 'w':
                sentence_Counter[TWENTY_TWO]++;
                break;
                case 'x':
                sentence_Counter[TWENTY_THREE]++;
                break;
                case 'y':
                sentence_Counter[TWENTY_FOUR]++;
                break;
                case 'z':
                sentence_Counter[TWENTY_FIVE]++;
                break;
            }
                for(k = 0; k < ABC_LENGHT ; k++)
                {
                    if(sentence_Counter[k] != 0)
                    {
                        counter++;
                    }
                    if(counter == 25)
                    {
                        printf("there is: %d counters",counter);
                    }
                }
          
        }
    }
  
}

My code is doing a very simple thing:
it gets a sentence and checks if the sentece is a panogram.
my problem is simple i dont understand why the if condtion: if(counter == 25) is allmost always met,even if i input only one or two words.