problem on firefox – after update to enfold 2.7.1

Hi
After update to latest WP 3.9.1 and Enfold 2.7.1 i have problem (only on firefox). I saw space on top and before header . When i scroll down , the content of page appear on top of page

I have some custom styling on quick CSS box:

.four.units.single-product-main-image.alpha {
overflow: hidden;
}
.iconbox .iconbox_content .iconbox_content_title {text-transform:none;}
.entry-content-header .iconlist_title {text-transform:none;}
.avia-builder-el-1 > section:nth-child(1) div:nth-child(1) > h2:nth-child(1){text-transform:none;}
section.av_textblock_section:nth-child(17) > div:nth-child(1) > h2:nth-child(1) {text-transform:none;}
.gm-style-iw{color:blue;}
section.av_textblock_section:nth-child(18) > div:nth-child(1) > h2:nth-child(1){text-transform:none;}