I’m currently using 4.16.2 and am having this exact problem and cannot figure out how to fix it. I have absolutely no plugins, no Bluetooth controllers or wireless mice or anything. Software was working fine, I was in the middle of making a game, then I suddenly couldn’t type when I right clicked in the node area, and cannot select anything, it just shoots up to the top. I have reinstalled Unreal twice and even tried installing an old version 5.15.3 to no avail.