A hotel's final bill left a six-figure block of extras out of its own total.
The detail was all there, on another sheet. It just never reached the sum, so the balance looked like a large refund. Recomputing every line from the charges, instead of trusting the hotel's total, shows it at once.
The same check covers deposits still calculated on an old room block, rates that don't match the contract, and nights billed after the guests left.