can't change pre-event record on Dahua 4300s and PC-NVR

All,

I'm using Smart PSS/PC-NVR with a Dahua 4300s. When viewing recordings through the iDMSS iOS app, it seems there's always 45 seconds of recording prior to a motion event, despite what I set it to in the cameras web UI.

It's not a huge deal, just a little annoying to have to skip ahead 45 seconds for every event (especially because the iOS app has some issues in that department).

Anyone else having this experience?

Thanks,

Justin