I tried to repeat your problem, creating a color correction with 4 masks and pasted the attributes to another clip, as you do in your movie.
It works fine for me, but I noticed that if I change the scale of the other clip and then pasted the attributes then the masks where out for place.
So it seems that the position of the masks is relative to the scale (and maybe other parameters under Transform / Crop / Distort, but I haven’t experimented more). Maybe you can find your problem there?
I tested to Paste attributes and checking both “Color” and “Transform” (all boxes) and then the mask got applied correct. But of course that changed the scale of the second clip and you will have to manually change that back afterwards. (Or duplicate the clip before pasting the masks, and then copy attributes from the duplicated clip and only paste the Transform-parameters back to the original clip. Then you delete the copy. Maybe that could work, even if it’s awkward?).