DXF file : wrong Y scale in Luban


I am trying to import a DXF file in Luban for laser cutting, but the shape is deformed in the workspace. It has the wrong Y dimension.

This is what I get in Luban :

The sketch is distorted in the Y axis as you can see in the 6 elliptic holes, which should be circles, not ellipses. Sorry I can’t display the original DXF as the forum won’t allow me to upload more than one picture in this message.

The X size is correct (24.31 cm).

Ho can I get Luban to import the file correctly ?