Only the chat message that appears after executing the /bingo spread command has a whitespace character at the beginning, so I suppose it ended up there by an accident.

Screenshot showing this issue:

This actually is intentional so it's easier to see where the list starts and ends. Maybe I'll add another whitespace to make it clearer.

Hmmm, what do you think about adding "[Bongo] " instead?

Not sure. Maybe I'll do, but I thinks the way it is now is not bad.