Search result by TITLE produces results with title without that word

Hi,

In plugin setting i set search by TITLE, but the search result list shows a lot of result without that specific word in the title.

For example if I have just one post title with the word ‘house’ in the title (only house) the search result list shows a lot of words (without the word house) and – of course – also the post ‘house’ but not in the first position

These results come in alphabetical order and the ‘right’ results comes in its alphabetical position (not as first).

For example (searching ‘house’):

Abacus
Basket
Beer
…
House
Table
washing machine

If I set to search only by title, searching by ‘House’ I should have just the resulting post House (if no other titles contain the term House):

Could you please help me?