Random people visiting my Springfield

I brought this up before.....this has been happening to me for awhile now. I'm also getting "FRINK" a lot instead of a name. I freaked when it started happening, thinking these odd names were people getting logged into my town in error and were spending my donuts! But, that's not happening.......I never see the odd names come up when tapping handshakes. WEIRD!! And it's only happening in one of my towns.