In the last 16 hours there has been only 1 (very trivial  3.136-3.175) upwards diff change, despite block time being half target time and diff re-target =2 hours.

Coin Specifications
Algorithm: Scrypt
P2P Port: 54449
60 second block time
2-hour block difficulty re-target
5 confirmations per transaction
120 confirmation mined block maturity

Is my understanding broken?