matching shingles issue

[vit]

I have Solr 4.2.1
I am using the following analyser:
                <fieldType name="text_shingle" class="solr.TextField"
positionIncrementGap="100">
                        <analyzer type="index">
                        <tokenizer class="solr.WhitespaceTokenizerFactory"/>
                        <filter class="solr.ShingleFilterFactory" 
minShingleSize="2"
maxShingleSize="5"
                                outputUnigrams="true" 
outputUnigramsIfNoShingles="false"
tokenSeparator=" "/>
                        </analyzer>
                        <analyzer type="query">
                        <tokenizer class="solr.WhitespaceTokenizerFactory"/>
                        <filter class="solr.ShingleFilterFactory" 
minShingleSize="2"
maxShingleSize="5"
                                outputUnigrams="false" 
outputUnigramsIfNoShingles="true"
tokenSeparator=" "/>
                        </analyzer>
                </fieldType>



for Query: 
description_shingle:Highest quality

I am getting Result:
<arr name="description_shingle">
      <str>Highest standards of quality installations!</str>
</arr>

So the result does not have shingle "Highest quality"
Instead it has 
"Highest standards of quality"

The question is why I am getting this match



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