concatenate a string with the results of group-object

I wrote a script to get the 10 most recent entries in the Windows application log. It works 
fine, but I would prefer to format the output differently.
The output looks like this:
server1\
Count Name
----- ----
    9 1008
    1 1010



server 2\
Count Name
----- ----
    5 256
    5 258

I'd like it to look like this.
Server Count Name
------ ----- ----
server1    9 1008
server1    1 1010

Server Count Name
------ ----- ----
server2    5  256
server2    5  258
Ideally, the server name would only appear once per group, but I'd settle for what I showed above. 
Where does the "\" after the server name come from? Why are there all those empty lines between server groups?
$S = get-content -Path c:\scripts\PowerShell\servers.txt

Foreach ($Server in $S)
    {
    if (test-connection $server -quiet -TimeToLive 5 -Count 2)
        {
             $events = get-WinEvent -ComputerName $Server -logname application -Maxevents 10 -ErrorAction silentlyContinue
             $output1 = $events | group-object -property Id -noelement | sort-object -property count -descending -ErrorAction silentlyContinue
             $output2 = Out-String -InputObject $output1 -Width 100
             join-path $Server $output2
        }
    else
        {"Could not connect to " + $Server}
    }
Thanks,
Matthew