WooCommerce product layout broken after update

I am using the Savile Row theme with WooCommerce. Products on the homepage and category pages are not laid out properly after the latest update (4.6.1). They show as a square of four, rather than a row of four on the homepage, and in alternating rows of one and two on category pages.

The issue can be seen on the live demo for the Savile Row theme, under ‘On sale’ on the homepage, and on the shop page: https://demos.templateexpress.com/savile-row/

I have posted in the support forum for my theme but have received no reply so wondered if there was a fix for this that didn’t require reverting back to an older version of WordPress.

Thanks in advance for any advice!