First of all, I deleted my main company ocassionally =) That is not a bug, but there should be a better foolproof, maybe. It's really frustrating loosing almost all progress and currency as well...
The bug is that I've created new company with same name and faction as previous had. And now I see in "near to me" top my previous company stats with that name (18-15-0), not my new one. I wonder if it should keep deleted company stats in rankings, especially with those company's name collision.
that's a known "issue", that will be fixed with next patch. From next patch, when you delete a company, it will be removed from the current ladders. Patch will also clean the ladder, removing every deleted company.