Reports

The root cause is that your lines

$a

and

$b

generate uncaptured output in the top-level script context and so result in an implicit call to Out-Default to display the output on the console.

This is then passing the whole output from both lines into a single call to Format-Table which has a quirk that it waits for 300ms for more data to arrive before it decides which columns to display. It looks like in that 300ms only the data from $a is received, so it's locking the columns down to Name and Group. When the output from $b is received it doesn't automatically add the GroupMembership column.

@Santiago Squarzon's answer works around this by aligning the property names in $a and $b so the columns determined by Format-Table are consistent across all of the output.

Another option is to explicitly pipe the individual variables into Format-Table like this:

$a | format-table

...

$b | format-table

which will render two separate tables with their own columns calculated based on input to each separate call to format-table, and will result in this on the console:

Name               Group               
----               -----               
D2\\[email protected]    {ADMINS, WebService}
D2\\[email protected]   WebService          
D2\\[email protected]  WebService          
D2\\[email protected]   ADMINS              
D2\\[email protected] WebService 

Name               GroupMembership     
----               ---------------     
D2\\[email protected]    {ADMINS, WebService}
D2\\[email protected]   WebService          
D2\\[email protected]  WebService          
D2\\[email protected] WebService

See these links for more gory technical details:

79318926