My 2665 / 2685 appears to count a banknote as a wrong denomination.
The Safescan 2665-S and 2685-S are able to determine the value of a mixed stack of banknotes. To ensure accurate judgement of the denomination, it is important to verify that there are no folded banknotes in the stack before feeding them into the device. When the length of a banknote is reduced by folding, its dimensions may become the same as another denomination. As a result, the device could make a wrong judgement on the denomination which will influence the counting result. Make sure there are no folded banknotes in the stack.
By following this instruction, proper value counting is ensured and the risk of wrong denomination judgement by the device is limited.
