Mirod, I'm testing with XML::Twig v3.15 on WinXP and v3.16 on Linux, both produce the same behavior.

Here is a minimal test stub that re-creates the formatting issue on my test machines.

#!/bin/perl -w
use strict;
use XML::Twig;

my $file = 'input.xml';

my $parser = new XML::Twig(KeepSpaces => 'true', ErrorContext => 2);

$parser->parsefile($file);

my $sc = $parser->root->first_child( q{ServerCluster[@Name="cl_app302_
+prod"]} );
my $ps = $sc->first_child('PrimaryServers');

$ps->cut_children;

$ps->insert_new_elt( Server => { Name => "New_1"});
$ps->insert_new_elt( Server => { Name => "New_2"});

open(PF, "> out.xml") or die "can't open file $!\n";
$parser->root->print(\*PF);
[download]

The input.xml file contains:

<?xml version="1.0" encoding="ISO-8859-1"?>
<Config ASDisableNagle="false" AcceptAllContent="false" IISDisableNagl
+e="false" IgnoreDNSFailures="false" RefreshInterval="60" ResponseChun
+kSize="64">
    <Log LogLevel="Error" Name="/opt/IBMWebAS/logs/native.log"/>

    <VirtualHostGroup Name="foobarcom">
        <VirtualHost Name="foo.bar.com"/>
    </VirtualHostGroup>

   <ServerCluster CloneSeparatorChange="false" LoadBalance="Round Robi
+n" Name="cl_app302_prod" PostSizeLimit="-1" RemoveSpecialHeaders="tru
+e" RetryInterval="60">
      <Server CloneID="umjbf6mv" ConnectTimeout="0" ExtendedHandshake=
+"false" LoadBalanceWeight="2" MaxConnections="-1" Name="swel3p_cl_app
+302_prod" WaitForContinue="false">
         <Transport Hostname="swel3p.bar.com" Port="8132" Protocol="ht
+tp"/>
      </Server>
      <PrimaryServers>
         <Server Name="swel3p_sg_app302_prod"/>
         <Server Name="swel4p_sg_app302_prod"/>
         <Server Name="swel1r_sg_app302_prod"/>
         <Server Name="swel2r_sg_app302_prod"/>
      </PrimaryServers>
   </ServerCluster>
   
        
   <!-- APP URI groups point at urls -->

    <UriGroup Name="event/event.war_URIs">
        <Uri AffinityCookie="JSESSIONID_302" Name="/event/*.jsp"/>
        <Uri AffinityCookie="JSESSIONID_302" Name="/event/ThreadedEven
+tServlet"/>
     </UriGroup>

   <!-- Route statement bring it all together -->

   <Route ServerCluster="cl_app302_prod" UriGroup="event/event.war_URI
+s" VirtualHostGroup="foobarcom"/>
</Config>
[download]

Which on my systems produces:

<Config ASDisableNagle="false" AcceptAllContent="false" IISDisableNagl
+e="false" IgnoreDNSFailures="false" RefreshInterval="60" ResponseChun
+kSize="64">
    <Log LogLevel="Error" Name="/opt/IBMWebAS/logs/native.log"/>

    <VirtualHostGroup Name="foobarcom">
        <VirtualHost Name="foo.bar.com"/>
    </VirtualHostGroup>

   <ServerCluster CloneSeparatorChange="false" LoadBalance="Round Robi
+n" Name="cl_app302_prod" PostSizeLimit="-1" RemoveSpecialHeaders="tru
+e" RetryInterval="60">
      <Server CloneID="umjbf6mv" ConnectTimeout="0" ExtendedHandshake=
+"false" LoadBalanceWeight="2" MaxConnections="-1" Name="swel3p_cl_app
+302_prod" WaitForContinue="false">
         <Transport Hostname="swel3p.bar.com" Port="8132" Protocol="ht
+tp"/>
      </Server>
      <PrimaryServers><Server Name="New_2"/><Server Name="New_1"/></Pr
+imaryServers>
   </ServerCluster>
   
        
   <!-- APP URI groups point at urls -->

    <UriGroup Name="event/event.war_URIs">
        <Uri AffinityCookie="JSESSIONID_302" Name="/event/*.jsp"/>
        <Uri AffinityCookie="JSESSIONID_302" Name="/event/ThreadedEven
+tServlet"/>
     </UriGroup>

   <!-- Route statement bring it all together -->

   <Route ServerCluster="cl_app302_prod" UriGroup="event/event.war_URI
+s" VirtualHostGroup="foobarcom"/>
</Config>
[download]

-Nitrox

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