Hello ,
I see that you are using the Get viewport size from the player controller. This returns the size of the HUD canvas. Are you making any alterations to the size of the HUD canvas? The reason I as is because when I change the screen resolution I am having no issues other than the image offset being a little off. But I compensated for this by simply dividing the half size of the widget by the screen ratio.
Change:
Here is my Designer tab in case there is any confusion.
