Hello, @Linna,
Thanks for using our Theme and for contacting us.
Actually, The links are working fine, there is no issue with the links. I have checked and confirmed it. Also, I recorded a video for you, please watch it completely: https://streamable.com/k56kzu
The issue is on each and every link the content doesn’t appear on the page it looks the same on every link. Now, The thing is my account page and its content is coming from the WooCommerce plugin our theme has nothing to do with it. Please check the plugin support forums for a fix in order to solve your issue.
https://woocommerce.com/document/how-to-get-help/
Regards 8Themes Team.