looks like you have something inside the right top bar. You can deactivate this section under Theme options > Header & Subheader > Extras section. But to increase logo on mobile, all you can do is clear the padding for mobile logo:
@media only screen and (max-width: 767px) { .header-plain #Top_bar .logo #logo { padding: 0 !important; } }
Comments
looks like you have something inside the right top bar. You can deactivate this section under Theme options > Header & Subheader > Extras section. But to increase logo on mobile, all you can do is clear the padding for mobile logo: