Hi @kevin_redding,
As you've discovered, the assignment point value and quiz point value can be different in New Quizzes. For the most part you'll want to make sure the point values in the assignment details and quiz builder match, but there are scenarios where an instructor would want to have a quiz with questions worth 20 points that only counts for 10 points in the Gradebook or vice versa. The assignment point value is what will display in the Gradebook.
While what you're trying to do isn't technically a regrade, you can fix the assignment point value using the regrade tool. To do this, open the assignment details page for the quiz and enter the correct total point value, then click Save. Next follow the regrade instructions to regrade any question on any student's submission. You won't be making any changes to the correct answer or point value and will keep the option to "Award credit for correct answer only"--the regrade just serves to push the assignment point value change to the Gradebook. Once the regrade is applied, refresh the page and you should see the total point value and student scores updated in the Gradebook.