Issue with expression in powershell statement

Hi,

Does anyone know why this wouldn't work? To me it looks correct..

get-distributiongroup -resultsize:5 | select Name,@{Name="mbrCount";Expression={((Get-DistributionGroupMember $_.Name).Count)}}

The issue is that the mbrCount value only returns on the last 1 or 2 objects in the group of objects! All the others appear blank

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