Main menu adjustment in Theme Options

Hi,
My main page is not adjusting to the options set in Theme Options.
1. Typography
I changed all options to Open Sans. I can see that in other pages the Headers, Body, etc changed to this font.
The main page – Body text changed to Open Sans. But Headers stays odd. Thin and High like not Open Sans for sure. I don’t know how to check what font is it. When I inspect element (I’m not a programmer at all…) I can see for header that does not look like Open Sans (main page):

html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em, img, ins, kbd, q, s, samp, small, strike, strong, sub, sup, tt, var, b, u, i, center, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td, article, aside, canvas, details, embed, figure, figcaption, footer, header, hgroup, menu, nav, output, ruby, section, summary, time, mark, audio, video {

border: 0;
font-size: 100%;
font: inherit;
vertical-align: baseline;
margin: 0;
padding: 0;

}

That what I can see for body that looks like Open Sans (main page):

html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em, img, ins, kbd, q, s, samp, small, strike, strong, sub, sup, tt, var, b, u, i, center, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td, article, aside, canvas, details, embed, figure, figcaption, footer, header, hgroup, menu, nav, output, ruby, section, summary, time, mark, audio, video {

border: 0;
font-size: 100%;
font: inherit;
vertical-align: baseline;
margin: 0;
padding: 0;

2. Theme Option -> Main Navigation
“I have Search Field in the Header” ON. It doesn’t show up on Main Page. It shows on any other pages (blog, contact, etc). Why?

3. Where can I change the font for Footer? It looks like also Headers in footer changed from Open Sans to other font. Not sure if I paste the right information but this is what I see under Inspect element.

element {

}
#footer h3 {

color:

#c8c8c8;
font-size: 16px;
line-height: 22px;
margin-top: 0px;
margin-bottom: 22px;

}
h1, h2, h3, h4, #menu a, .heading_font {

font-family: “Oswald”, arial;
font-weight: 300;

}
h1, h2, h3, h4, h5, h6, .title, .heading_font, .htabs a, .boc_side_widget ul.menu li a {

letter-spacing: 0em;

}
h1, h2, h3, h4, h5, h6, .title, .heading_font, .htabs a, .boc_side_widget ul.menu li a {