Upgrading to Version 2.6.4 introduces gutters to 2 columns

Hi. Upgrading Page Builder from 2.4.25 to 2.6.4 introduces CSS like this:

#pgc-19-4-0, #pgc-19-4-1, #pgc-19-5-0, #pgc-19-5-1 {
width: 50%;
width: calc(50% – ( 0.5 * 30px ) );
}
#pgc-19-1-0 {
width: 34%;
width: calc(34% – ( 0.66 * 30px ) );
}

Previously, this CSS would look like:

#pgc-19-4-0, #pgc-19-4-1, #pgc-19-5-0, #pgc-19-5-1 {
width: 50%;
}
#pgc-19-1-0 {
width: 34%;
}

The new version of the plugin has introduced a gutter.

How do I resolve this please?