The blue 'highlighting' that you speak of is Word recognizing a potential sentence structure error. The sentence begins with "5.1 would now like....". Word is telling you that "5.1" is expected to be a word other than 5.1 as in "I would now like...etc".

If 5.1 is supposed to be a numbered paragraph...well, we are going into another issue (i.e., Numbered Headings, Understanding styles | ShaunaKelly.com and others).

Hope this begins to help...