I have been trying to tempban myself from Console. It doesn't work (it shows the notification that I was banned, but I'm still connected to the server. My server is in offline mode and my bungeecord is also in offline mode. And it doesn't matter whether I set onlinemode to true or false in BanManager config. The command /kick works fine, but doing it without arguments randomly kicks someone.
I'm using PaperSpigot 1.10.2 and latest BanManager snapshot. This happened in PaperSpigot 1.9.4 as well.

Offline mode is not officially supported by BanManager.
Offline mode support was originally a contribution from the community.
So if you run your server in offline mode (unless you have a online mode bungee proxy before) you are on your own.

Odd. I'll see if I can reproduce this.

Same problem, there is a fix now ?

I've not been able to reproduce this unfortunately. Fresh install of BM and Spigot, server set to offline mode, as well as BM set to offline mode. Bans work as expected.

Scratch that, found the issue