Using latest version 220.127.116.11, I’m having a simple file with only one element.
When exporting the selected element as PNG, it is cropped right and bottom:
(above is a zoomed screenshot of the PNG image in Paint.NET)
Doing an SVG export shows the same erroneous crop behaviour:
(above is a screenshot from Inkscape)
Both, the SVG export as well as the PNG export should export the full selected element(s), without any cropping.
In case it helps, here is an example Lunacy file that I used in the above steps (remove the .ZIP extension after download).