Checked atlases and corresponding xml and it looks like it picks graphics for actors from the 2x bitmap using the 1x coordinates and size.

Backgrounds have, what little I can see of them, the right coordinates, but the size is different from both 1x and 2x xml, now they seem to show the top left corner clipped to 200x80.

Graphics do, however, come from the right Atlas.



Attached game settings if they may influence the choice of coordinates.