If you look at your first post you can see the AC thinks it's heading is east. This comes from the .txt log that I looked at when I posted #14 above. This and the flight after launch is a textbook example of having launched from a site that is geomagnetically distorted. If you haven't sent your Spark off yet please retrieve the .DAT files before you do.
Geomagnetic distortions are often caused by rebar in concrete. But, usually the effects don't extend beyond 2 or 3 feet (this can be seen by looking at the .DAT). In your case I suspect the problem may have been a nail, screw, bolt or bracket used to hold the railing together. You could try moving a regular compass over the surface of your launch site to find that metal object. The effect would be localized; i.e. moving the compass 1 cm would be significant.
Here is an example that is similar to your incident. Launch was from a park bench. Unbeknownst to the pilot there was a steel under structure that caused the compromised Yaw
Mavic crashed due to compass error
In your flight the Flight Controller thought the heading was east at launch. Shortly after launch the Spark drifted north. Since the FC thought the heading was east that means the FC thought the Spark had drifted west and that the correction would be to fly to the east; i.e. to the right. That's why the SPARK veered off to the right.
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