

It's a bit of a late answer, but I hope it helps you and perhaps others, as I have seen more mysterious indent questions / posts on the net. It is often safer to paste as unformatted text and copy the formatting from the surrounding text.

So it looks like copy/paste can bring along some funny settings from the source document. After re-opening it I could set it to 'narrow margins' and the whole text was properly aligned. After that just re-setting it back to 'narrow' would not work - I first had to save the document. The main thing was I could fix it by setting the Page layout to 'normal margins', so everything got aligned. I made that visible via File > Options > Advanced > Show document content -> ticked the option 'Show text boundaries'. If you click at the beginning of a paragraph and press Tab, Word will indent the first line to the first user-defined tab stop or the first default tab stop. Press Ctrl + Shift + T to decrease or remove the indent (move to the left). I could see there were different text sections in the document (that 1 odd line was a separate section). If you keep pressing Ctrl + T, Word will keep indenting by tab stop to the right. The document had 'narrow margins' (menu > Page Layout > Margins > narrow) but I think it had a line copied into it from another document with 'normal margins' and thus copied that formatting. My suspicion is that it had to do with margins. I had a similar thing (Word 2013) with a document I got from someone else.
