It may be that when you filled in your resume, you didn't take the range selected by the mouse out of the academic selection column after you filled in your undergraduate degree. If you scroll down or up, you can switch to a master's degree with a mixed mouse.

After completing the undergraduate course, click on the blank space with the mouse, then save it and give it a try.

I have been in this situation before. I don't know if yours is true. Please try it.