Program skipping true if-statements, but executing false ones

Okay, so I'm (trying) to make a word guessing game, while also trying to learn about coding. My problem here is, that the program skips true if-statements and executes false ones. Here's a section:

#include <iostream>
#include <stdlib.h>

/*Some more #include...*/

using namespace std;

int main()
{
        int Lives = 5, Sel_Word, i;
        string Sel_Diff;

        /*Some more variables*/

        while(Lives >= 1)
        {
                cout << "Difficulty...";
                cin >> Sel_Diff;
                if  (Sel_Diff == "Very Easy")
                {

                        /*Executes game for that level*/

                }

                /*Gets skipped, when I enter "Very Easy" for
                some reason*/

                if (Sel_Diff == "Exit")
                {
                        break;
                }

                /*Works fine*/

                if (Sel_Diff == "Easy" || Sel_Diff == "Medium")

                /*Et cetera...*/

                {
                        cout << "\n\nDifficulty does not yet     exist!";
                }
                else
                {
                        cout << "\n\nDifficulty does not exist";
                }

                /*These two execute, when I enter 
                "Very Easy" for some reason*/

        }
}

Someone please help, thanks! Notes: I looked to see if someone has the same problem, but I didn't find anyone, although I found a question about a false statement executing, which doesn't help me. Also, I don't know if this happens only in c++, haven't used c or c#.