As you see "TNK DIST 25,8km" is not normal. It should be almost same as odometer. max 10% difference could be, but your is too much (25.8 OBDuino, and 3-4km in odometer).
Did this value droped to 0 after reseting?
Add "SPEED" pid to screen and does it shows correct speed?
Did you modified "speed adjustment" or something?
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