ok this may not be a bug just me being clumsy but twice in a game I'm playing I've "bought" heroes I don't remember buying. The issue comes whenever I minimize the warbarons web page and when I come back to the page I find I have bought the hero even though I did not accept it at first. I'm using Chrome. It doesnt happen everytime but every once in a while it will.
So what happens is I usually play with gmail and warbarons up on separate tabs in chrome. If i start a turn with a hero offer, I'll decline it and say an email pops up. I'll switch over to look at the email. When I switch back it like auto-buys the hero.
its weird.