When tying a related item to a KB article for instance the popup will load in the middle of your screen but the moment you select a category from the drop down and hudu loads the list of options the entire window shifts to the top of your screen which makes it so your mouse will be hovering a random entry vs the text field you just typed in
very minor but would be a great QOL improvement if the search / drop down part of the linked related items popup was statically positioned on the browser.