What themes are you guys using? You can easily verify if it is a theme conflict by installing the default WordPress theme – WooCommerce with all other plugins deactivated – that would show you that the Gallery works just fine. Then activate the plugins 1 by 1 until you find the culprit.
Best of course to do this on a dev or a local. That is exactly what any developer would do to find the culprit – when you do please post here which one it is and I’ll have a look at why it is happening and let you know what I find. Thank you