Part of our mission is to educate job seekers on effective personal marketing strategies. Today's employers are interested in seeing your skills, accomplishments, and experience and sometimes, especially with job seekers who have more than three or four years of experience, that takes more than one page. This is not a grammar mistake but rather a writing mistake. We are all taught to write in the passive voice in high school English class.
Most formal writing is in the passive voice and it is second nature to write in that fashion.
Use of first person and possessive pronouns. Lack of information. Use of the wrong format for the job seeker's individual situation. There are chronological, functional, and combination formats. Each one is suited for certain employment histories or employment goals.