To add to this: it seems closing compare item windows in wrong order (ie. closing item you right-click on originally for info instead of compared equiped item) when using right-click (to close windows) moves the item info & compare item windows to the right until they're almost entirely off screen if you compare multiple items one after the other (such as in a store). I don't seem to be able to drag them back to center (but maybe I'm clicking on the wrong part of the window - which is almost off-screen to the right). Once this happens, all info & compare info windows are stuck on the right with just a small part visible. This persists even if you reload the game (without quitting to main menu). Quitting to main menu & then reloading seems to fix the issue (until you cause it to happen again)...
