Given the OP's declaration that all he did was edit a Word document with LibreOffice, I can't see how that's relevant to the document now having text fields. I also can't see how Word 2007 is suddenly considered relevant, as it hasn't been mentioned anywhere else and, in any event, the OP was using LibreOffice on a Mac.

One possibility is that the document supplied by the employer contains content controls but no word processor I know of supports them on a Mac; neither does any PC Word version before Word 2007. Together that rules out everything the OP apparently has access to. Or maybe they're ActiveX controls, once again not supported by any word processor on Macs.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]