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

[dan]

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.