There is no need to increase panel's row size - not to mention 30 was the default size in 14.2 and making it bigger just because one icon in one specific theme looks weird doesn't sound like a good idea to me.
I think the reason for the weird look is this: At default panel row size (30), the icon is probably taken from
/usr/share/icons/Qogir/24/actions/web-browser.svg and it is just a link to
/usr/share/icons/Qogir/24/actions/network-connect.svg which is not what you would expect. The icon you expect does not exist in that directory. However when you increase the panel row size to 36 the icon is
/usr/share/icons/Qogir/32/apps/web-broser.svg which is also a link, but points to
/usr/share/icons/Qogir/32/apps/internet-web-browser.svg, and that's exactly the icon you see in the panel with increased row size.
My solution: either modify the icon theme so that /usr/share/icons/Qogir/24/actions/web-browser.svg points to a more appropriate icon, or just change the icon with right-click->Properties. Icons such as org.xfce.webbrowser or just plain firefox icon work at the default panel size.