There's a big comprehensive reputation FAQ sitting around somewhere, but I'll give you the short version:
The person who repped you simply didn't have enough "power" to change your rep one way or another. This generally means a new user who hasn't posted much at all + never received reps before, since your rep "power" is a combination of those factors.
Whether that was intended to be negative or positive isn't known because the forum software didn't register it -- at least, that was the case last time I asked.
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