If you are experiencing this issue then, it must be because of endpoint conflict between the User Registration plugin and other plugins such as WooCommerce.
To resolve this problem, all you need to do is change the endpoint in the User Registration plugin Settings.
So, Go to your WordPress admin dashboard and, go to User Registration -> Settings. Then, you can see all the general settings. If you scroll down, you can see the Endpoints settings.
Here, you can see the Lost password endpoint as “lost-password“. Now, you need to change it to “forgot-password“. Then, don’t forget to Save Changes.
After that, go to the WordPress Settings and, click on the Permalinks. Now, scroll down and, click on the Save Changes button. Then, refresh the page and the issue will be fixed.