Shape divider - leaves thin line

Hi Balbooa,
I've used the shape divider on several sections on a website. Unfortunately, on two of the sections the shape doesn't cover the background completely and leaves a thin line.
What's the best way to resolve this, so it works for all screen sizes and browsers? (Chrome has two such sections, Firefox shows only one).

I've sent a link to the website via tech support email.

Many thanks,
Marc