“Different password. It dosn't let me in.”

Correct, that is what passwords do 😉

“Look at this problem:”

I am not sure I understand. What is the link “in the generated image”? AFAIK, NoNonsense Forum does not generate any images. Is that a Mastodon thing?

If you have found a bug, the best way to communicate it is the issue tracker on GitHub: https://github.com/Kroc/NoNonsenseForum/issues