It's interesting to see that someone else experiences what I did until recently.

I had the right column turned off on my index (main) page and the new items rows were displayed in the space of the middle and right columns. There were four thumbnails per row and, when I hovered over the rightmost image in any row, I had the same effect as that described by meljen: Hovering on the right side of the image caused the medium size image to appear, then, if the mouse cursor was moved slowly to the left of the same thumbnail, a second medium image appeared to the left of the first and remained there. If I hovered over another thumbnail, this extra "ghost" image remained there and did not go away until I scrolled up or down the screen so as to move its thumbnail outside the screen.

This only happened with Chrome and I thought it was something wrong with my setup. I turned on the right column again, meaning that the new items are now not very close to the right side of the template and the issue disappeared. It wasn't a "big" issue but annoying nevertheless.

I visited meljel's site and saw what the issue is. Perhaps this is something that could be investigated by the developing team and, in my humble opinion, it has to do with the Google Chrome rather than with IH.