This forum doesn’t support uploading images – you’d need to just add plain text or HTML links to the images.
There are two proceed to checkout buttons.
This could be a problem with the payment gateway plugin that you’re using, or it could be a conflict with the theme / another plugin.
The best way to determine if the issue is being caused by a theme and/or plugin is to temporarily switch your theme to Storefront and disable all plugins except for WooCommerce. If you can install plugins, install Health Check. On the troubleshooting tab, you can click the button to disable all plugins (except for the payment gateway and WooCommerce) and change the theme for you while you’re logged in to that session without affecting normal visitors to your site. Note that Health Check may not count Storefront as a default theme, so you can also use Twenty Seventeen as well.
If that resolves the issue, then slowly re-enable features until you find the one that’s causing the conflict.