Received interim clearance but investigation closed

I was informed a while ago that my clearance investigation had been closed, however today I learned that I had received an interim clearance. I am confused as to how this is possible, as my understanding of an interim clearance is that it is granted to individuals still undergoing investigation. I have not yet been interviewed. Does anyone know what this might mean or entail? Thank you!

If it was closed as “approved,” it isn’t a bad thing. If they stopped the BI…it can be for a few reasons. Contract out of money, an error, etc. For my client I have to take positive steps to cancel a clearance in process. Enough of an action that I would never accidentally do it. I would check with the FSO and see if there is an issue with the Interim, it is possible they pulled it back after finding something.