If you ever try to send lots of merit at once, you might understand what i meant. It's different case for adding his alt. account into trust list though.
Check out my merit history, and you will see that I can send lot's of merit, so it's no misunderstanding.Have you checked my history[1]? It's denser than yours[2].
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I am not saying just entering wrong number or zero, that can happen to anyone and it happened to me as well.
Meriting the wrong post has happened too 
Luckily, it wasn't a bad post, and it wasn't mine. It happened when I scrolled back up while reading, and didn't check carefully enough.That's what i meant.
[1] https://loyce.club/Merit/history/359716.html
[2] https://loyce.club/Merit/history/1410401.html