The frontcover of the PhD and HDR styles have numeric page numbers starting from 1. Then the \frontmatter changes the numbers to roman numbers starting from 1. The result is that the pages are numbered as 1, 2, 3, 4, i, ii, iii, ....
It may be better to have continuous numbers, such as: i, ii, iii, iv, v, vi...
The frontcover of the PhD and HDR styles have numeric page numbers starting from 1. Then the \frontmatter changes the numbers to roman numbers starting from 1. The result is that the pages are numbered as 1, 2, 3, 4, i, ii, iii, ....
It may be better to have continuous numbers, such as: i, ii, iii, iv, v, vi...