I had a lot of problems with the file's codification, and my issues seems to be the same that @cormieja had. Make sure that your file is UTF8 and the characters inside are properly written. Some times, when we save data inside the files, if you don't have a properly codification some characters could be "bad represented" and then, when Splunk try to read it we have issues like yours.
I hope this clue will be useful.
Regards.
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