Dear Stefanos Pramadiotis,
Please go to Template Manager, in Layout tab, check what layouts be chosen on Default Layout, Override Layout in all menu ID. Then please open these xml files on folder: yoursite\templates\sj_jare25\layouts, find and cut the code:
<position class="span2" data-normal="span2d4" data-tablet="span2d4" data-stablet="span4" type="feature">@logo</position>
and paste before code:
<position class="span5" data-normal="span4d8" data-tablet="span4d8" data-stablet="span4" type="feature">@menu</position>
Thanks