I have visited your Single Product page, but the issue you mentioned is not visible in the Product Gallery section. I have also noticed that you are using a 3rd party plugin named Dynamic Product Gallery for WooCommerce, for showing the gallery and that might be the reason for your issue.
I would suggest you test by deactivating the said plugin, if you find that the issue does not exist, I would suggest you contact Plugin Developer on this. Please remember that we don’t offer any support to 3rd party plugins or any issues related to it.
If you find the issues still exist after deactivating the plugin, please provide a few more information like a screenshot marked with the issue or any video, which helps us to replicate and diagnose the problem.