My if test stops after compering with more then 10 char

I am comparing a string with the same string just reversed. It is working fine until the number i compare is bigger then 10 char. Why?

import java.util.Scanner;

public class A {
 public static void main(String args[])
 {
    Scanner sc = new Scanner(System.in);

    int level = sc.nextInt();
         if (level >= 1 && level <= 20) {
          //  System.out.println(level);
     }
    sc.nextLine();
    String reverse = "";

    String line1 = sc.nextLine();

    String line2 = sc.nextLine();

    // Reverse
    for(int i = line1.length() - 1; i >= 0; i--)
    {
        reverse = reverse + line1.charAt(i);

    }

    if(reverse.equals(line2)){
        System.out.println("Deletion succeeded");
    }
    else{
        System.out.println("Deletion failed");
    }
}

}