RE: Checkinwith.xyz - I think I found a little Bug

1. Uploaded image URL with double 600x1000x - We've fixed image URL issue yesterday. Just refresh browser or hit refresh button inside keychain app's in-app-browser.
2. {"success":false,"errorCode":5000,"error":"failed to sign and/or broadcast transaction"} - looks like you may be using HiveAuth based login & you didn't sign/approve transaction from keychain app. It's just a log message. Nothing wrong with that. In case if you encounter any issue, capture screen & share it with us to investigate & we'll look into it.
3. Failed to load resource = it shows up when you start typing hive user name in name of onboarder field or hive user name in login screen. Let's say you type me in input field - there is no such user, resulting is no avatar image for it. So, you can kindly ignore this error. You can reproduce this by keeping inspector on when you type in onboarder name.

So far all the issues you've pointed out has no critical or blocker bugs. Those are, I would say dev logs ;)