Forum:Anonymous user editing while blocked? How is that possible?

Ok, so once in a while some random comments or random spam appears in the wiki, I delete it and block the user, but this time I went to block someone that had just spammed and.... He's already blocked! Is there anything to do about this? And how is that even possible?

The link to the user page, where you can probably see his block and his last comment: Yechnagoth 23:07, March 1, 2012 (UTC)


 * It looks like the edits (March 1, 13:42) were made before the block time (March 1, 23:08). If I'm missing something, can you be more specific about the times and edits you're looking at? Also note that the user is still allowed to edit their own talk page under this block. --Dopp http://images2.wikia.nocookie.net/__cb32675/wikia/images/e/e9/WikiaStaff.png (help forum | blog) 23:11, March 1, 2012 (UTC)
 * The VSTF are a team that deals with vandalism and spam cross-wiki, if we see (or someone tells us about) a spambot, then we'll block it across Wikia. After that, we try our best to clean up it's mess across every wiki, but sometimes - due to the nature of the tools we have, we can't catch every edit they've made. This is one of those times that for whatever reason their edits weren't removed. As Dopp has previously mentioned - this block happened after the spambot had edited, so there's no error, we just couldn't track down it's edits to your wiki.
 * We'd appreciate reports of spam at our wiki. You can use the Users and IPs needing checked page for spambots like these, a quick add of their IP address to the page means that we can delete all of it's contributions across wikia, and block it globally. For reports of more complex problems, you can use Report:Spam --  Random Time  23:14, March 1, 2012 (UTC)
 * I went to change block to see if there wasn't any option that allowed him to comment, so it removed it, but I had blocked him yesterday or the day before, and he was still blocked when I checked his page, I now blocked him again for a month, which is the time you must be seeing.


 * Thanks, I'll do that if it happens again, the "spam" we usually get on Wakfu wiki is just random comments or swearing usually, this might be the first bot.


 * Edit: Weird. It doesn't show the first block in the block log, just the last one of today. Could it be because it got removed while I went into the change block editing ? Yechnagoth 23:22, March 1, 2012 (UTC)
 * Global blocks don't show up in the block log --  Random Time  23:29, March 1, 2012 (UTC)


 * But its not about the global block (unless a global block removes any previous blocks). I had blocked him for a few days before that. Shouldn't it appear regardless of being blocked globally after? Yechnagoth 23:35, March 1, 2012 (UTC)
 * Nope, it doesn't - are you sure it was the same user? --  Random Time  23:39, March 1, 2012 (UTC)