Well, that is easy. look at the listing that caused you to post your complaint.
No one is saying that it was something that you did. Spend some time and actually read and think about what people are posting here. Someone, not google, and probably not you, linked to your site and hit a space bar after the period when they were typing in your URL. %20 is a space, as anyone with any experience on the web can tell you.
Do you have anyone that you work with, whose opinion you trust, that understands programming? You can ask them what happens to a space when it gets "URL encoded".
Then show them the listing, and ask if that could have happened if someone put up a bad link to your site with a space in it.
If you are not willing to take advice from people that have a better understanding of the issues than you do, it is no wonder that you have not made it back into the index aftter florida even though most others have.