I created a new title page text document, and pasted some text into it. It showed in the editor in Times New Roman as expected.
I chose “Compile As Is,” and when I compiled it, all the text on that page was in Courier.
I selected one line and changed it to another font, and that line was changed, all the rest was in Courier.
I fixed it for me by selecting all the text and changing it to Times New Roman.
Perhaps there’s some reason that it worked like that, but if not, you may want to fix it.