I recently noticed that behavior when I was blueprinting something in a tight spot. The problem was, my view got blocked from the list being shifted outside the frame and blocking the view at the entities.
You can see that behavior pretty good in the pics. For a better visibility I pulled the frame more to the right. Otherwise the view at the bottom row with the blue inserters would be blocked by the list. (see in pic blueprint2)
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[1.1.4] Shifted item-list in blueprint frame
Re: [1.1.4] Shifted item-list in blueprint frame
That's working as intended. The icons stay next to the cursor.
If you want to get ahold of me I'm almost always on Discord.