What causes race results ordering close finishers incorrectly?

Finish order is recorded by the frame a car crosses the line rather than the precise sub-frame crossing time, so cars that cross in the same frame get an arbitrary order.

How do I catch this when it only happens for some players?

Capture it automatically from the player's device with the full stack trace, the device and OS, the build, and a breadcrumb trail of what they did. That turns a vague complaint into a specific, reproducible issue you can fix without owning the hardware it happens on.

How to Fix Race Results Ordered Wrong When Cars Finish Close Together

Quick answer: Record each finisher's exact crossing timestamp by interpolating where in the frame the car crossed the line plane, then sort by lap count and that precise time.

Two cars crossing nose to nose get ranked by whichever was processed first that frame, not who was actually ahead. Computing a sub-frame crossing time fixes photo finishes.

How to fix it

1. Interpolate the crossing time

When a car crosses the finish plane in a frame, find the fraction of the frame at which its position passed the plane and record frameTime + fraction * delta as its exact finish time.

2. Sort by laps then crossing time

Order finishers first by total laps completed, then by ascending exact crossing time, so the genuinely-ahead car wins even in a same-frame photo finish.

3. Lock results once finished

Snapshot each car's finish time the moment it crosses and do not recompute it, so subsequent physics or lapping does not reorder the final standings.

Catching the ones you can't reproduce

The hardest version of this to fix is the one you can't reproduce — it only happens on a player's hardware, OS, driver, or save state, under conditions that simply aren't present on your machine. A report that says “it crashed” or “it froze” gives you nothing to act on, so the bug survives release after release while quietly costing you players.

Automatic error capture closes that gap. Each failure arrives with its full stack trace, the device and OS, the build number, and a breadcrumb trail of what the player did right before it broke, so even a failure you have never seen becomes a specific, reproducible issue. Fold identical failures into one signature ranked by how many players each hits, and your worklist sorts itself worst-first instead of arriving as a stream of vague complaints.

This is where a tool like Bugnet earns its place. Its SDK captures every error automatically with the full stack trace plus device, OS, memory, build, and game-state context, folds duplicates into one grouped issue with an occurrence count, and ties each to the build it first appeared on — so you fix the problem that hurts the most players first and confirm it is gone when its signature disappears from the next release.

Reproduce it once with full context and the fix writes itself. The hunt is the expensive part.