Strange overlap of station run times? (resolved)

I have an OpenSprinkler Pi running firmware 2.1.9 and a zone expander. I have 8 zones and 1 master valve. The master valve is connected to the expander module, and I have it set as such in the config settings. I’ve created a simple watering program with the 8 stations. When I run it, everything works, but the first two stations are running at the same time. When I preview the program it shows them running at the same time as well. I don’t want them to run together, but can’t figure out how to get them to run one after the other. Have I misconfigured something to cause this?
Thanks for help anyone can offer.

EDIT: Ah, figured it out shortly after I posted this. 😉 Sorted. The half-baked mobile browser I was working with wasn’t rendering the “sequential” box for the channel correctly so I couldn’t check it. Once I viewed it on a decent browser, it worked fine. I checked it in Chrome on my device, and it renders fine.