The number of spaces between numbers and titles in the paper is 1, which means that the alignment of numbers is not set to left alignment. The number of spaces between numbers and titles in the paper is 1, because your numbers don't have enough tab stops. When the number is 2 digits, it is just right. When the number is 3 digits, it is not enough. Word automatically jumps back to a tab stop, so it seems that the number of spaces between numbers and titles in the paper is 1.