Looks like you have some Custom CSS for the widths of the gallery and the summary eg.
.woocommerce #content div.product div.summary, .woocommerce div.product div.summary, .woocommerce-page #content div.product div.summary, .woocommerce-page div.product div.summary {
width: 60%;
}
The %’s need to lower, currently gallery is 35%, summary is 65% but they dont consider the margins and padding being applied. So adjust the above CSS to width: 55%;
and it should be resolved.