Hi,
I see that you have some custom css to control the size of logo. Just comment that code:-
.page-header-standard #logo img.retina{display: inline-block;width: 60px;}
Find this code:-
.full-center #main-navigation ul.menu > li > a, .full-center .header-right ul.menu > li > a, .full-center nav.float-alt-menu ul.menu > li > a, .full-center .header-right div.text, .full-center #header .aux-item ul.social-icons li,
.full-header-stick #header, .full-header-stick #logo, .full-header-stick .header-left, .full-header-stick .header-right{
line-height: 90px;
height: 90px;
}
And replace with:-
.full-center #main-navigation ul.menu > li > a, .full-center .header-right ul.menu > li > a, .full-center nav.float-alt-menu ul.menu > li > a, .full-center .header-right div.text, .full-center #header .aux-item ul.social-icons li,
.full-header-stick #header, .full-header-stick .header-left, .full-header-stick .header-right{
line-height: 90px;
height: 90px;
}
Thanks
Mohammad