[SOLVED] Different results for Generalized Hebbian (GHA) in loop

In my opinion the following problem constitutes a bug, but maybe I'm doing something wrong.

I am using the Generalized Hebbian Algorithm (GHA) Operator and everything works fine until I use it inside a "Loop parameters" Operator. I use the loop so that I can run the GHA Operator with different parameters for the number of components. However if the loop does multiple iterations I get different results compared to a single execution.
My investigation of the problem showed that beginning with the 2nd loop iteration the GHA operator is calculating a different premodel. There seems to be a side effect from the previous iteration.

My process:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<process version="6.0.006">
  <context>
    <input/>
    <output/>
    <macros/>
  </context>
  <operator activated="true" class="process" compatibility="6.0.006" expanded="true" name="Process">
    <process expanded="true">
      <operator activated="true" class="loop_parameters" compatibility="6.0.006" expanded="true" height="76" name="Loop Parameters" width="90" x="179" y="165">
        <list key="parameters">
          <parameter key="GHA.number_of_components" value="[3;4;2;linear]"/>
        </list>
        <process expanded="true">
          <operator activated="true" class="retrieve" compatibility="6.0.006" expanded="true" height="60" name="Retrieve w1024_training" width="90" x="45" y="75">
            <parameter key="repository_entry" value="//Anwendungsfall/w1024_training"/>
          </operator>
          <operator activated="true" class="generalized_hebbian_algorithm" compatibility="6.0.006" expanded="true" height="94" name="GHA" width="90" x="246" y="75">
            <parameter key="number_of_components" value="4"/>
          </operator>
          <operator activated="true" class="support_vector_machine" compatibility="6.0.006" expanded="true" height="112" name="SVM" width="90" x="380" y="75"/>
          <operator activated="true" class="retrieve" compatibility="6.0.006" expanded="true" height="60" name="Retrieve w1024_test_set" width="90" x="45" y="255">
            <parameter key="repository_entry" value="//Anwendungsfall/w1024_test_set"/>
          </operator>
          <operator activated="true" class="apply_model" compatibility="6.0.006" expanded="true" height="76" name="Apply Model" width="90" x="246" y="255">
            <list key="application_parameters"/>
          </operator>
          <operator activated="true" class="apply_model" compatibility="6.0.006" expanded="true" height="76" name="Apply Model (2)" width="90" x="380" y="255">
            <list key="application_parameters"/>
          </operator>
          <operator activated="true" class="performance_classification" compatibility="6.0.006" expanded="true" height="76" name="Performance" width="90" x="514" y="165">
            <list key="class_weights"/>
          </operator>
          <connect from_op="Retrieve w1024_training" from_port="output" to_op="GHA" to_port="example set input"/>
          <connect from_op="GHA" from_port="example set output" to_op="SVM" to_port="training set"/>
          <connect from_op="GHA" from_port="preprocessing model" to_op="Apply Model" to_port="model"/>
          <connect from_op="SVM" from_port="model" to_op="Apply Model (2)" to_port="model"/>
          <connect from_op="Retrieve w1024_test_set" from_port="output" to_op="Apply Model" to_port="unlabelled data"/>
          <connect from_op="Apply Model" from_port="labelled data" to_op="Apply Model (2)" to_port="unlabelled data"/>
          <connect from_op="Apply Model (2)" from_port="labelled data" to_op="Performance" to_port="labelled data"/>
          <connect from_op="Performance" from_port="performance" to_port="result 1"/>
          <portSpacing port="source_input 1" spacing="0"/>
          <portSpacing port="sink_performance" spacing="0"/>
          <portSpacing port="sink_result 1" spacing="0"/>
          <portSpacing port="sink_result 2" spacing="0"/>
        </process>
      </operator>
      <operator activated="true" class="collect" compatibility="6.0.006" expanded="true" height="76" name="Collect" width="90" x="380" y="165"/>
      <connect from_op="Loop Parameters" from_port="result 1" to_op="Collect" to_port="input 1"/>
      <connect from_op="Collect" from_port="collection" to_port="result 1"/>
      <portSpacing port="source_input 1" spacing="0"/>
      <portSpacing port="sink_result 1" spacing="0"/>
      <portSpacing port="sink_result 2" spacing="0"/>
    </process>
  </operator>
</process>
[ /code]