I saw the screenshot you attached. This is not an issue by any means it happens when your internet connection is slow and interrupting the page to load. Please try using a stable connection then check back.
If you want to ask anything else then please elaborate with the help of some relevant screenshots to check it myself and help you out accordingly.
Please check how it works with a default WordPress theme just to check whether the issue is with our theme or not.
If it behaves fine with the default WordPress theme then deactivate all the third-party plugins, activate the parent theme, and provide with admin panel login details of the website with the permission to debug then we will troubleshoot with theme plugins.