Termius checks the password using the haveibeenpwned.com service (HIBP). The Termius app searches for the first 5 characters of SHA-1 of the user-provided password in HIBP API per the Cloudflare k-anonymity implementation.
Termius never sends the original (unencrypted) password or enough information to discover what the original password is.
The password is pa$word.
SHA-1 of the password will be
The first 5 characters are SHA-1 of the password is
617AD, the rest is
Here are the search results: https://api.pwnedpasswords.com/range/617AD.
This data tells us the password has been leaked in 96 breaches.
That message means you've exceeded the number of allowed login attempts. It's for security reasons; a measure preventing from password guessing.
5 minutes should pass after the last attempt to enter a password before another attempt can be made