Help with plant sitter device

Has anyone here used those plant sitter devices with the ceramic cones, the ones you connect to a container of water to care for your plants while you're away? It's supposed to sense the level of moisture in soil and siphon water as needed. I was planning to use some during an upcoming vacation, but I hooked them up to two of my plants and within hours I had water everywhere!

I've searched online to see if there's something I'm doing wrong, but couldn't find anything helpful. All the advice was for people who said the device didn't water their plants at all. Any ideas?

Yes, these were plants in soil, not orchids in bark.

hmmm...Angie, what types of plants and how long will you be away?

Is this the type you attach a hose to a reservoir or do they attach to a bottle of water over the cone?

We'll be gone 3 1/2 weeks. It is the type where you attach a hose to a reservoir.

I was hoping to use it for hibiscus, spider plant, one spathoglottis, and a jewel orchid.

I found some pictures online and noticed that the reservoir was lower than the cone. We had it higher; I don't know if that makes a difference. I may try it again that way, but this time I'll test it in the bath tub first. It's kind of funny the info says the device 'will not overwater'. Oh well.

Not familiar with the one you have, but for Father's Day my grandkids gave me those glass balls, that are supposed to water your plants, automatically. They emptied out over night. I tried them a 2/nd time, same thing, so I "recycled" them.