How Kodi timer and NextPVR Schedule works?

[octopus]

Just using Kodi 15.2 with NextPVR 3.6.6 for a couple weeks, I have a question regarding how timer and scheduling works between Kodi and NextPVR.

If I setup to record a series of TV shows in NextPVR, the Kodi TV Timer will not mark the program being scheduled. But the TV shows will record.
If I setup to record a series of TV shows in Kodi, the NextPVR schedule will only mark the program being scheduled to record once. But the TV series seemed to be recorded every time even when Kodi is not running.
If I setup a timer to record a TV show one time in Kodi, the NextPVR will not mark the program being scheduled to record.

Here is some of my observation which is confusing to me. I just want to make sure I understand how the timer and recording works between Kodi and NextPVR.

Which is the best way (Kodi or NextPVR) to setup recording for series of TV shows?

Thanks.