Match_phrase_prefix finds not related elements

I have implemented a full search and the matcher that fits better my
approach is match_phrase_prefix.

elements:
title: 'search test'
title: 'search test 1'
title: 'search test 12'
title: 'search test 2'
title: 'search test b'
title: 'new search test'

The weird case is when I search with the term 'search test 1' and the
results are:
title: 'search test'
title: 'search test 1'
title: 'search test 12'
title: 'search test 2'
title: 'new search test'

it only should match the title: 'search test 1' and title: 'search test
12', but I don't know why is matching the other elements.

If I try with the with other terms like 'search test 2' or title: 'search
test1' returns what is expected. I'm using the standard analyzer but I have
also tried with the whitespace analyzer.

Any hint here?
Thanks a lot,
Carlos

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