There is nothing insignificant or strange in this. Though I'm not actually sure if the reason for your ban is what you are calling a mistake, but if that is true, then here is what could've happened:

klkentkl got banned before you (probably for plagiarism, though I couldn't manage to find any proof since it is an headache to surf over 165 pages of bounty reports in order to find a plagiarized post). And then you used the social accounts that he (klkentkl) has been using, to submit some reports, which technically makes you the alt of that guy, or him yours (doesn't matter, actually). Now, if you have already read the rules and know about them, then you should know that there is a rule about ban evasion (Rule No. 25 in Unofficial list of (official) Bitcointalk.org rules, guidelines, FAQ) which is, that a person whose one account is banned from the forum is not allowed to create and use another account. The only thing that person can do with the newly created (or the other) account is to open a ban appeal and only post in that thread.

Moral of the story: You used another user's social accounts, and it made you look like it is an alt account of yours. When that guy got banned and you were still posting, you were found to be guilty of ban evasion hence getting you banned as well.

P.S: What I said is only what might have happened, and is solely based on assumptions. There is no solid proof of this as of now except for the posts that Veleor has brought up.

Lol! Seriously? And you didn't realize it even after posting it? Or even later sometime? Don't you look at your post once it is posted? I thought you guys (bounty hunters) were very cautious about these things since their earnings are dependent on these reports and all, and you are making an excuse of posting someone else's credentials by mistake.


Yes, you do. Read the rules and obey them if you don't want to face any negative consequences of your actions.

So, it really looks like forum post was made before it was posted on VK. Forum post was made on 2:17 PM, February 13th while VK post was made on 6:22 PM on the same day in my timezone. So, I think you're banned wrong for plagiarism.
But about ban evasion it will be difficult to prove that you just used someone's else report as template and forgot to change links.

Can you tell how to view exact time of post on VK. Because I only can that it was posted on 13th February without hours and minutes. If things ta\hat you're saying is true, I think there is chance that you can be unbanned. But as @roycilik said, if your VK and Bitcointalk timezones are different, it's possible that post on VK was made before you commented on Bitcointalk.
Edit: Things posted by Veleor makes your situation worse.