Unreliable speed values (was: Speed is not showing)

I have a session, and all the data comes in except for speed. It's staying at zero.

I also have other sessions where the speed just jumps...e.g., it's at 45 and instantly becomes 85. I know my car is quick, just not instant quick.
Speed is set for fast channel and I use the ScanTool 427201 OBDLink LX Bluetooth; android galaxy s7, and gopro 6
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