I found out today that a duplicate rule on one of my objects does not fire. After doing a lot of testing I found out that it only doesn't fire for records which were installed as sample data when the org was created with a Trialforce Template.
For example, a record with the name AR was installed as part of the Trailforce Template. When you try to create another record named AR, the duplicate rule does not pop up. When you create a record in the org, for example, OH, then the duplicate rule fires when trying to create another record with the same name.
I have been searching around the documentation for any information about this but have not been able to find any. Does anyone have any insight on why this is happening?