Hello Mate,
 
1,2 I fixed in your site for you. Upgraded ves blog extension to latest version.
3, The font family of ves megamenu we are using the css code. You can use custom css code in theme control panel in admin to change the font:
.ves-megamenu {
background: transparent;
font-family: “Poppins”, sans-serif;
}
 
About the font of price we are using the css code, you can custom it:
 
.price {
   color: #f44336;
   font-size: 13px;
   font-family: “Poppins”, sans-serif;
   font-weight: 600;
}
 
4, I install a datasample of the demo 4 theme layout for your site.