I can't read logs, the other experts on this forum are here to help. But, sounds to me like you took off *before* the homepoint was established using GPS and when it finally triggered later on, you were over a swamp and that's where your...
Too much truth there.
If you want to get a feel for flying, find a used quad-copter RC model (not a drone). The first thing you note on your first takeoff is that it will immediately start running with whatever wind or breeze is present...
They need a better PR team, too. Their posted "apology" said they were sorry for any "distress or inconvenience caused". Heart surgery on your boy is not an inconvenience.