Valve turns on at the end of program and off at the beginning of next scheduled

[draggaj]

I have not seen that happen in years of testing the software.
It might have something to do with the problem you reported earlier about the valves responding to inverted program logic.

That should only happen if you are using low-lever trigger relays in the system. If you have the valves connected directly to ospi boards it seems like there is something else going on.

Also if you use the Relay Board plug in, it too does something re the 'hi'/'low' signalling for relays as well. e.g. I use relays that need a 'high' signal to switch them.....In Relay Board Plug in I have this set for High, and in Options > Station Handling I have Active Low unticked...
Try that if your relays need the plug in....what type of relays are you using (link) and how connected to the RPi?

Bob