Hi Hardy,
This issue is because re-projection rectangle make the external result’s extent center changes a little. Our developer had fixed it.
The fix is in version ThinkGeo MapSuite 11.0.0-beta025, you can get it here https://www.nuget.org/packages/ThinkGeo.MapSuite/11.0.0-beta025, this version should be updated in one or two days.
Regards,
Don