Today I flew (offline) and I noticed the same altitude difference between CL650 altimeter and X-Plane's own alt ind -variable. I also recycled few times the altimeter between local and std QNH with X-Plane's own command, but the difference between CL650 altimeter and X-Plane's own altitude did not change. Please see the picture below. I've also attached the Log.txt.
I'm using HS CL650 1.4r1 and ASXP 7618.
Log.txt