@zenitix: Some computers have single clicking as an alternative to double clicking. Is hovering counting as a single click? If yes, that's what happened, and you just need to change the option.

@kamimatsu: (part 3) Point is, it's only sometimes, and therefor not a software feature, cause it doesn't happen until I actually click, but it happens way too damn much, cause I've accidentally closed and opened too many things.

@kamimatsu: (part 2) It also happens in games, for example, if I'm playing Fallout 4 like I have recently, I'll click to sell something, and it will also sell the item that was just underneath the one I wanted to sell.

Plus firing semi-autos twice.

@kamimatsu: It's not that, because it's not consistent, it's SOMETIMES when I click, it clicks twice causing things to happen, like me closing a window accidentally because it was under a window I wanted to close. (part 1)