It is not you, just the companies staffed by poor managers. You obviously had nothing to do with upper management decisions that could have made or broken the company.
Imagine those who worked for Commodore, Pets.com, etc.? Oh well one good thing out of it is that nobody from those companies can report something bad on you, not that you did anything bad, but sometimes cow-orkers make things up to put others down and boost themselves up. That is what happened to me the past few companies that I worked for. Machiavellian cow-orkers, you know I don't like them.