How to debug rules that are not being run? I have few rules bound to the Event: Completing the checkout process 

After completing the checkout process these rules should run - but they do not work...

I am using Devel module to debug the Rules and in the dblog there is nothing about these rules - There are only rules that are actually being run upon other events.

How can I debug this ?
/config/workflow/rules/settings

Enable all debugging and it should show in the log if the event is correct. It will go through each condition and say which passed and which failed.