See http://wiki.splunk.com/Where_do_I_configure_my_Splunk_settings
This is a great site that shows which servers should contain the correct Splunk configuration files.
In your case, you are settings TRUNCATE (parsing phase) in your props.conf and sending it to your Splunk forwarder server. Based on the above link the only time you should set parsing on a forwarder is when it's a heavy forwarder. Otherwise, you should set your parsing configuration on your indexer.
So, trying adding your TRUNCATE setting in your props.conf on your indexer server and see if that resolves your issue.
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