Missing houses & crashing houseboat

I built 2 houses on the volcano island within the past 3 weeks. The other day, I woke up and they are gone from the map- it shows that I have built on the lot, but only a fence around each property. When I click to go to the lot, it takes me to another random house I’ve built (not always the same place).

I built a houseboat from the architect tab, and when it was done, I clicked to finalize. It shut my app down. Here’s what I’ve tried: deleting and redownloading the app, clearing my cache, logging out and in, turning off the new lighting, restarting my phone, closing all other apps, contacting app support. They said I had to ask here, and that they couldn’t help me. I’m incredibly frustrated, because now I can’t build anything, since my houseboat is in limbo and it shuts down if I click on it. Any ideas?

the picture is of one house property and the houseboat.