It's the ping-pong effect. Jeph can't seem to commit to any single framing for well, anything, regarding Cubetown and as a result the inconsistencies keep piling up. And this only extends to the comic overall as the commentary on the current comic implies that Jeph's going to bounce back between Cubetown and Northampton, which is a recipe for disaster given how the comic is already overstretched (and you just know he's going introduce a half-dozen minor characters at this party).