I don't understand upvotes and downvotes sometimes

When I make a completely positive post, talking about positive experiences and being nice, it gets downvoted. When I make a reply telling someone to keep up the honorable behaviour (it wasn't sarcastically, I genuinely meant that) it gets downvoted. How is it that if you're nice on the boards, you get more downvotes than upvotes? Is there something that I'm not understanding?
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