Issue with reported speeds

I’m still having trouble with the speed display. The incoming JSON reports a speed of 31.9 m/s, but the server is showing 36.72 mph. I was actually going about 70 mph at the time. I'm on server version 6.7.3 using the docker image. Any idea whats going on here?
Thanks!

Server logs please.

2025-06-24 13:33:21  INFO: [T8ab06b98] connected
2025-06-24 13:33:21  INFO: [T8ab06b98: osmand < 172.17.0.1] POST / HTTP/1.1\r\nHost: 192.168.10.10:5055\r\nUser-Agent: python-requests/2.32.4\r\nAccept-Encoding: gzip, deflate\r\nAccept: */*\r\nConnection: keep-alive\r\nContent-Length: 272\r\nContent-Type: application/x-www-form-urlencoded\r\n\r\nid=1&lat=51.6*************&lon=0.40**************&timestamp=2025-06-24T12%3A33%3A21.000Z&odometer=297879.9&speed=31.91&heading=218.05&accuracy=2&altitude=49.21&Moving=Yes&Activity=in_vehicle&Battery+Level=50%25&Battery+Charging=Yes&Speed+Limit=70+mph&Overpass+Source=local
2025-06-24 13:33:21  WARN: Position forwarding failed: 0 pending - HTTP code 404 - RuntimeException (PositionForwarderJson:80 < *:73 < ...)
2025-06-24 13:33:21  INFO: [T8ab06b98] id: 1, time: 2025-06-24 13:33:21, lat: 51.6****, lon: 0.40***, speed: 31.9, course: 218.1, accuracy: 2.0
2025-06-24 13:33:21  INFO: [T8ab06b98: osmand > 172.17.0.1] HTTP/1.1 200 OK\r\ncontent-length: 0\r\n\r\n
2025-06-24 13:33:21  INFO: [T8ab06b98] disconnected

I don't see a JSON.

Ah sorry. Is this what you're looking for?

2025-06-24 16:29:32 INFO 172.17.0.1 - - [24/Jun/2025 16:29:32] "POST / HTTP/1.1" 200 -
2025-06-24 16:29:32 INFO request.data: b'{"location":{"timestamp":"2025-06-24T15:10:21.243Z","coords":{"latitude":51.6******,"longitude":0.33*****,"accuracy":3.6,"speed":13.52,"heading":272,"altitude":122.84},"is_moving":true,"odometer":132982.5,"battery":{"level":0.65,"is_charging":false},"activity":{"type":"in_vehicle"},"extras":{},"_":"&id=2&lat=51.6******&lon=0.33*****&timestamp=2025-06-24T15:10:21.243Z&"},"device_id":"2"}

This is not a standard Traccar log. If you want some help, please provide full and complete context.

Where do I find the JSON's in the tracker-server.log files?