Load Failed for … index.js

When we submit forms through our contact page (or leave all blank and click “Send”) the messages don’t have any styles and the URL that we are sitting at has “/#wpcf7-f4144-p4136-o1” appended to the base URL.
In the Web Developer window, we see this message:
Load failed for the <script> with source “…./wp-content/plugins/contact-form-7/includes/js/index.js?ver=5.4.1”.
Can you help us resolve these issues –
– How to enabled styles
– How to avoid adding “/#wpcf7-f4144-p4136-o1” to the URL after clicking “Send”?

The page I need help with: [log in to see the link]