Peaking is kind of a "dumb" function if I understand it correctly. It just displays a green pixel where it detects x amount of contrast between two pixels, as such, things like noise an probably fool it-- especially when it doesn't have anything else to go on. The camera, afterall, doesn't know what it's really looking at. It just says, oh, this is a super low contrast scene (black) but there is a y% difference between these two pixels, so I suppose this is a thing which is in focus.
Unless it gets worse-- e.g. you see it all over the images in the real world to the point of making it useless-- or you see it recorded in footage, keep calm and keep shooting