What is wrong with my boolean variables that keeps changing back to false?

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

#include "types.h"
#include "rental.h"
#include "sort.h"

bool isNumber(char strParam[])
{
    for( int i = 0; strParam[i] != '\0'; i++ ) {
	if( isdigit(strParam[i]) == 0 ) {
	    return false;
	}
    }

    return true;
}

bool readProperties( char *strFilename, RentalProperty **ppProperties )
{
    char strLine[512];
    char strArgument[512];
    char strRemainder[512];
    char comma;

    bool isStreetExist;
    bool isNumExist;
    bool isRentExist;
    bool isRoomExist;

    FILE *fileIn = fopen( strFilename, "r" );
    if( fileIn == NULL ){
	perror( strFilename ); 
	return false;
    }

    int rc = 0; 
    int propertyCounter = countProperties( *ppProperties );
    while ( !feof( fileIn ) ) 
    {
	isStreetExist = false;
	isNumExist = false;
	isRentExist = false;
	isRoomExist = false;

	fgets( strLine, 512, fileIn );
	*ppProperties = realloc( *ppProperties, ( propertyCounter + 1 ) * sizeof( RentalProperty ) );

	do {
	    rc = sscanf( strLine, "%[^,]%[,] %[^\n]", strArgument, &comma, strRemainder );
	    strcpy( strLine, strRemainder );
	    if( strncmp( "streetName=", strArgument, 11 ) == 0 ) {
		isStreetExist = true;
		( *ppProperties )[ propertyCounter ].streetName = ( char* )malloc(sizeof ( char ) );
		strcpy( ( *ppProperties )[ propertyCounter].streetName, strArgument + 11 );  
	    } else if ( strncmp( "streetNumber=", strArgument, 13 ) == 0 ) {
		if( isNumber( strArgument + 13 ) == false){
		    fprintf( stderr, "\nError: %s - Invalid Argument", strArgument);
		    return false;
		}

		( *ppProperties )[ propertyCounter ].streetNumber = atoi( strArgument + 13 );
		isNumExist = true;
	    } else if ( strncmp( "rent=", strArgument, 5 ) == 0 ) {
		if( isNumber( strArgument + 5 ) == false){
		    fprintf( stderr, "\nError: %s - Invalid Argument", strArgument);
		    return false;
		}

		( *ppProperties )[ propertyCounter ].rent = atoi( strArgument  + 5 );
		isRentExist = true;
	    } else if ( strncmp( "rooms=", strArgument, 6 ) == 0 ) {
		if( isNumber( strArgument + 6 ) == false){
		    fprintf( stderr, "\nError: %s - Invalid Argument", strArgument);
		    return false;
		}

		( *ppProperties )[ propertyCounter ].rooms = atoi( strArgument + 6 );
		isRoomExist = true;
	    } else {
		fprintf( stderr, "\nWarning: %s - Unknown argument", strArgument);
	    }

	} while( rc >  1 );
        
        if( isStreetExist || isNumExist || isRentExist || isRoomExist ){
          //SOME CODES
        }
	propertyCounter++;

    }

    *ppProperties = realloc( *ppProperties, ( propertyCounter ) * sizeof( RentalProperty ) );
    (*ppProperties)[propertyCounter - 1].rent = -1;

    *ppProperties = &(*ppProperties)[0]; 

    fclose( fileIn );
    return true;
}