I MAJORLY SCREWED UP!

[Mura]

Was your system in the bathroom when you took a shower? The steam could have something to do with it.
You're lucky it didn't corrupt your town entirely

 

[Munyo]

Uhm, I would wait for a villager to want to move in. Before they can set a sign up, time travel and the day you go to town, the sign will be up and nothing will be unchanged.