Thanks for asking.
- I can confirm the problem of tabs not working on my end. Please make sure that you are using the compatible version of WooCommerce. As of now the compatible version of WooCommerce is 3.4.2. You can take a look at our version compatibility guide for more information. Second, please try testing for testing for a plugin conflict. You can do this by deactivating all third party plugins, and seeing if the problem remains. If it's fixed, you'll know a plugin caused the problem, and you can narrow down which one by reactivating them one at a time. Please take a look at version compatibility guide for more information. I am also sharing the link to our theme and plugin update guide that you can refer for some instructions on updating plugins.
2. I can confirm that the shortocodes are showing up on the website. First, if you see the screenshot the shortcodes is showing up in between Content and the Reviews
Div. There might be a case of something breaking the implementation. Of late did you made any changes in the template? Also i suggest you to try switching from X Theme to default WordPress theme and see how it goes.
3. Please take a look at the solution mentioned in following thread:
You also have the option to take a look at following article:
Please make sure to setup child theme before making any code changes. I am sharing the resources that you can take a look to get started in setting up child theme.