I can create a username and password and login successfully, but only the first time when visiting this website. If I ever come back to try to login in using Lastpass, the username is filled with gibberish or machine code instead of the correct username. So I have to type the username manually then press submit. Everything from there works as it should. Just strange the username is gibberish and doesn't work after logging in successfully the first time. I can keep creating new password entries and the username will always work the first time, but never again.
This happens in Firefox v71. Tried it in Chrome v79, and it works fine, so must just be with Firefox.