Export 2x/3x/4x .... cutting issue!

I have a strange issue.

Exporting a grouped layer as 2x does not result in twice the size of 1x. Also 3x, 4x exports cuts the resultant image giving same size as 2x.

I usually use 2x exports to get a crispier quality, but if lunacy cuts the resultant image, its impossible to work with exports greater than 1x.

Hi

What are your Lunacy and OS versions please?