It looks like you customized the curly template a while ago, as more recent versions have that glitch taken out. At some point you will want to update your customization to the newer curly code, but for now what will fix it is to look for:
#wrapper {
background: #fff;
line-height: 0;
padding: 0 50px;
width: 100%;
}
...and remove
line-height: 0;