Script is not adding 1 to the variable

//quiz begins, no answers correct
var correct = 0;

//ask questions
var answerOne = prompt("What color is Rey's lightsaber?");
if (answerOne.toUpperCase() === "blue" ) {
  correct += 1;
} 
var answerTwo = prompt("What color is Windu's lightsaber?");
if (answerTwo.toUpperCase() === "purple" ) {
  correct += 1;
} 
var answerThree = prompt("What color is Yoda's lightsaber?");
if (answerThree.toUpperCase() === "green" ) {
  correct += 1;
} 
var answerFour = prompt("What color is Vader's lightsaber?");
if (answerFour.toUpperCase() === "red" ) {
  correct += 1;
} 
var answerFive = prompt("What color is Kylo's lightsaber?");
if (answerFive.toUpperCase() === "red" ) {
  correct += 1;
} 

//output results
document.write("<p>You got " + correct + " out of 5 questions correct.");

//output rank 
if (correct === 5) {
  document.write("<p>You earned a <strong>gold</strong> crown!</p>");
} else if ( correct >= 3 ) {
  document.write("<p>You earned a <strong>silver</strong> crown!</p>");
} else if ( correct >= 1 ) {
  document.write("<p>You earned a <strong>bronze</strong> crown!</p>");
} else if (correct === 0 ) {
  document.write("<p>You did not earn a crown. :( </p>");
}