Building a Quiz in Storyline and the Submit Trigger for Correct isn't working

You're doing a lot of unnecessary work. 

You can use a standard Graded Fill-in-the-Blank question for this, as shown in the attached file. 

• The Submit [question type] trigger automatically checks whether the user answered the question. If not, it shows an "Invalid answer" message. So you don't need the "hint." 
• After the user enters an answer, the trigger automatically shows the built-in Correct or Incorrect layer based on what was indicated as the correct. 
• When you increase the Attempts >1, Storyline automatically adds a Try Again layer. It shows that instead of the Incorrect layer until the attempts are used up.

For more info, refer to the "Working with the Question Editor" section of the User Guide: Articulate Storyline 360 User Guide - E-Learning Heroes.