Bookmarks Ordering Issue as per the first number in the numbering format

[FREDRICK-GITHUB]

Bookmarks are created using the format "Page x". However, the ordering of the bookmarks is inaccurate

### Current Behavior(Steps to recreate):
Bookmarks are ordered as per the first number in the page number.
Say if you bookmark pages 1,3,10,17 and 20 you get:
Page 1
Page 10
Page 17
Page 20
Page 3

Note the pattern for the first numbers: 1,1,1,2,3

### Expected Behavior:
Last bookmark should appear last in the bookmarks list, being the highest number in that list.
This is what I expected:
Page 1
Page 3
Page 10
Page 17
Page 20