Works but doesn’t work

I’ve installed this plugin because I wanted an icon before every post title. I’ve 5 different categories for my articles (5 different games) and I wanted to have the game’s icon in front of the post title. That all worked well but … all of a sudden icons appear in the menus too! And not even the right icons and when I refresh the page the icons just change in another icon.
So … for what it’s worth I love the effort that was once invested into this plugin but it doesn’t do what it has to. Actually it does but it also has some side effects.