Strange behavior with Linq

[Akademos]

Hi,
I've got following XML:

<?xml version="1.0" encoding="utf-8"?>
<root>
  <Map livescore="Arka Gdynia" betfair=" Arka Gdynia" />
  <Map livescore="Wisla Krakow" betfair="Wisla Krakow " />
  <Map livescore="Olhanense SC" betfair=" Olhanense" />
  <Map livescore="Uniao Leiria" betfair="Leiria " />
</root>

I stored that xml once at a webserver and once at a local file. I'm reading the file with following code:

        private IScore injectBetfairIntern(String strBFTeamA, String strBFTeamB, String uri)
        {
            XDocument feed = null;
            try
            {
                feed = XDocument.Load(uri);
            }
            catch (FileNotFoundException fnfe)
            {
                return null;
            }

            var mappingTeamA = from map in feed.Descendants("Map")
                           where map.Attribute("betfair").Value == strBFTeamA
                           select new
                           {
                               Betfair = map.Attribute("betfair").Value,
                               GamblerWiki = map.Attribute("livescore").Value
                           };

            var mappingTeamB = from map in feed.Descendants("Map")
                               where map.Attribute("betfair").Value == strBFTeamB
                               select new
                               {
                                   Betfair = map.Attribute("betfair").Value,
                                   GamblerWiki = map.Attribute("livescore").Value
                               };
          
            foreach (var mapA in mappingTeamA)
            {
                foreach (var mapB in mappingTeamB)
                {
                    IDictionaryEnumerator enumLivescore = m_list.GetEnumerator();
                    while (enumLivescore.MoveNext() == true)
                    {
                        LiveScore score = (LiveScore)enumLivescore.Value;
                        if (score.TeamA.Equals(mapA.GamblerWiki.Trim()) && score.TeamB.Equals(mapB.GamblerWiki.Trim()))
                        {
                            Debug.WriteLine(String.Format("Added match {0} - {1} to watch", score.TeamA, score.TeamB));
                            return score.IncreaseRef();
                        }
                    }
                }
                
            }
            return null;
        }

I'm calling the function that way:

String uri = "http://www.myserver.com/myxml.xml";
IScore score = injectBetfairIntern(strBFTeamA, strBFTeamB, uri);
                if (score == null)
                {
                    uri = Application.StartupPath + @"\mylocalxml.xml";
                    score = injectBetfairIntern(strBFTeamA, strBFTeamB, uri);
                }

The strange thing is, that if I'm taking the online xml the values are found. But if I'm taking the local xml (delete the entries from the online xml to get to the local xml) it doesn't find the entries.
I have no idea what could be wrong there. Does anyone here know something?

Thanks in Advance

akademos