Why does it still show duplicates?

Almost always trailing spaces or differing capitalisation. Turn on trim and ignore case and they collapse.

Is the original order kept?

Yes unless you ask for sorting. The first occurrence of each line stays where it was.

Strip repeated lines with control over trimming, case, blanks and sort order.

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Paste your list.
Choose whether to trim whitespace, ignore case, drop blank lines and sort the result.
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Why does it still show duplicates?: Almost always trailing spaces or differing capitalisation. Turn on trim and ignore case and they collapse.
Is the original order kept?: Yes unless you ask for sorting. The first occurrence of each line stays where it was.

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