We just released version 1.9.1 of Tensei-Data.
This is a bugfix release one that is highly recommended if you use triggers. Version 1.9.0 introduced a regression that could under some circumstances lead to the behaviour that triggers are executed not once but multiple times.
To update the demo version you can use the following sequence of commands. Please export your cookbooks before doing this if you don't want to loose them.
% vagrant box update % vagrant destroy % vagrant up