WMTA output issue

Hi Experts:

I am facing a WMTA issue, we assigned this WMTA output in Delivery notes, once this Delivery note created the TO will be automatic generated immediately, normally the TO creation time should be the same with the time when delviery note generated, but here we have one hour time gap showed in TO, let's say the DN created at 9:10, the time show in TO is 10:10, it should be 9:10, I don't know why...