Product where the issue is occurring: https://marmotdev.it3k.co.uk/shop/women/jackets-women/ski-snowboard-jackets-women/wms-lightray-jacket/
We have found a problem with the zoom on hover functionality on woocommerce product pages.
Sometime when we zoom on the image then move the mouse away a 1px wide vertical line appears to the right of the image. This doesn’t happen every time but if you move the mouse over the image and out a few time it should appear. I cannot spot a pattern to when it does or doesn’t happen.