A few reasons are possible here.
1. There's no guarantee that the reported amount is the only thing that changed on your credit report. You should check for other changes (inquiries, new accounts, lates, etc
Since 25/5000 is still less than 1%, this shouldn't have triggered a 25 point drop
2. Depending on where you are getting your credit score, the score may have changed for other silly reasons- Closed accounts, old tradelines falling off, etc.
There's no way to tell for sure, but basically as long as you are confident that no bad marks appeared on your credit report, there's nothing you can do. Your score will bounce back next month or in the near future so long as there are no bad marks.
In My Wallet: Amex BCP (12/12) $50,000, Chase Freedom (12/12) $16,500, Cap1 Quicksilver (6/12) $14,000, Barclaycard Rewards (5/13) $10,500, Citi Prestige (4/16) $30,000
Last App: June 27, 2015