Thank you! It was actually an overcharge for a bit over $30 since it was a 2 night stay. I reached out to Marriott yesterday but the folio wasn't uploaded for customer service to see just yet. I called the hotel directly but was told to call back later when a manager is available. I'll report back.

The only odd part of all of this is that the Marriott app also reflected the higher rate so I wonder if someone at BRG messed up. I didn't go back and look at what the nightly rate was after the failed BRG in the app under the stay.