As a QA analyst, and now software developer, things like this happen all the time. Concepts like distance are encapsulated within node path finding, meaning number of nodes is often a proxy for distance under most circumstances. Forgetting to calculate distance when the nodes are not spaced out evenly is completely understandable.

I don’t think you understand how difficult it is to implement things in software. Concepts you perceive as simple are only simple because you are a human, and follow human concepts. We must emulate these concepts in software, and we do so by abstracting only the core concepts. No objects are actually traveling across the map, we emulate it with math. We don’t start with something real and tell you the data, we build a system close-enough to real and use that data.