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The option is "delete duplicate LINES".

When the file:-

a1
b1
a2

is sorted by TextPad on key from character 1, length 1, it results in

a2
a1
b1

TextPad seems to have reversed the order of "a1" and "a2". This is acceptable - I have not specified what order the second character (which is not ...

Are the files saved onto a UNIX computer from you PC using a SAMBA drive at any point? I occassionally get this problem when doing this (and I'm not usually converting between PC <-> UNIX format, so this is probably irrelevant).

Alternatively, block select the area of the file in question.

(This can be done using by selecting text while block select mode is on (Configure->Block Select mode) or pressing the Alt key when selecting).

If you want to change the four characters in EVERY line, then right-click->Fill Block will ...