These things happen very often in programming because programming has feedback loops.
If there's a bug - things on other levels will adapt to that bug, creating a "gettier" waiting to happen.
Other feedback-related concept is false independence. Imagine a guy driving a car over a hilly road with 90 mph speed limit. The speed of his car is not correlated with the position of the foot on the gas pedal (it's always 90 mph). On the other hand the position of the gas pedal and the angle of the road is correlated.
This is example popular in macroeconomics (to explain why central bank interest rates and inflation might seem to be independent).