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My guess would be the original text file had either a tab or series of spaces at the beginning of a line of text. However, with the Remove Indents option set (ticked) the text did not show them. Effectively, they were invisible.
As with many other kinds of media related text display, it is a good idea to have a capable editor which can display control characters and other inline markup for situations like you just encountered. This is especially true if any kind of Search & Replace (normal or regex) is done on the text -- which can accidentally break hidden commands/characters -- whether done by yourself or anyone previously.
Lots of editors include this function although it's not always prominently shown -- you might have to hunt for it. I know MS Word has such an option as does Notepad++ (free) for Windows.
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