There is a bug with money/accounts where people make random accounts which have different amount of bals when register, for example: if I was to do amazedmener16 instead of AmazedMender16 it would give me majority of the money on that account.

Use online mode and this won't be an issue.

Why do you create another ticket? What do you expect as a response? Don't use offline mode and you won't have issues. The big warning you see in the console when starting a offline mode server has a reason.

You can use Authme's NickCase protection

what you mean Authme NickCase?

Line ~291 preventOtherCase: true
If it's true, you can't join the serveur with amazedmener16 instead of AmazedMender16