Create a Quest Objective isn't working

I'm creating my own objectives within my quest, but the page won't let me click the "Next" button.  I have assigned each class to a Google Classroom assignment in order to complete the objective, but I cannot add the objective to the Quest Map until all the steps are completed.  I am stuck on the "Task" step.  I selected a Google Classroom and I selected an assignment for my first class, but for my second class, it says "Choose an Option" but it is grayed out and unclickable.  I cannot select "Next" to create any objectives because of this issue.