My house number is 110. My neighbor at 116 bought a condo in Florida. Why do I know this? Because for 3 months I was getting all of his HOA correspondence. People make mistakes. Technology just allows people to make mistakes in seconds that would have taken minutes before.
I wouldn't be shocked if they just had messy handwriting, and someone misread their "0" for a "6". It doesn't seem like it would be _that_ hard to accidentally close the loop a little low.