Upres VDB's Not Scaling correctly

I have done an upres and then converted that to vdb and there is a squeezing down on the z axis…I think it needs enlarging to 150 % but that still does not show correctly. It can be bodged if you do not have actual objects involved but in this case the vbd must fit the skull as the bcf does and hand manipulating that is very tricky and should not be necessary. Any ideas why this is happening ? Sorry the forum will not accept the files…too large but a simple test yourself should prove the point…it is the vdb from an upres that is the issue and is the same with both Redshift and Arnold