why atmega32 recieves just the last 16 characters of string?

Question

i use an atmega32 to communicate with SIM808. when module sends a string that contains more than 16 characters, atmega32 receives only the last 16 characters. it works fine with less characters. i use a 16*2 alphanumeric LCD to show the received data. i tried to extract part of the long string using strncpy().then i sent the extracted part to LCD, but LCD just shows nothing. i think something is wrong with AVR ,not LCD. what can i do? i wrote c code simply by using codevision UART libraries. here is the main code:

printf("AT+CGPSINF=2\r");
            scanf("%s",response);
            scanf("%s",response2);
            scanf("%s",response3);
            scanf("%s",response4);
            scanf("%s",response5);  
            lcd_clear(); 
            lcd_gotoxy(0,0);
            lcd_puts(response);
            delay_ms(1000);
            lcd_clear(); 
            lcd_gotoxy(0,0);
            lcd_puts(response2);
            delay_ms(1000);
            lcd_clear(); 
            lcd_gotoxy(0,0);
            lcd_puts(response3); 
            delay_ms(1000);
            lcd_clear(); 
            lcd_gotoxy(0,0);
            lcd_puts(response4);
            delay_ms(1000);
            lcd_clear(); 
            lcd_gotoxy(0,0);
            lcd_puts(response5);
            delay_ms(1000);
            strncpy(response3,response3 + 18,26 - 18); 
            lcd_clear(); 
            lcd_gotoxy(0,0);
            lcd_puts(response3); 
            delay_ms(1000);

response3[200] is for receiving long string.