Overlapping skills-panel

Hi folks, i´ve got a little issue with the skills panel. The col-md-10 overlaps the col-md-2. If i delete the classes col-md-6 col-sm-6 within firebird everything looks fine (<div class=“skills-list col-md-6 col-sm-6”>). What could be the problem?

Another question is if it iss possible to center the panel?

ups, i forgot to mention the domain: www.specialframe.com