Its normal. Indicating safety key is displaced.
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You have to check the speed sensor potion. Try to align the speed sensor or check is there is any dust accumulate on speed sensor.
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You have to check the speed senor for its positioning.
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Try lubricating the belt. My treadmill requires lubricant every now and then. Its not your treadmill but a treadmill is a treadmill. That's what stops the belt from slowing down due to friction. Go to your nearest Gym they may be able to sell you a tube of lubricant. Good Luck I’m happy to help further over the phone at https://www.6ya.com/expert/charles_6bf94c079488b145
Normally in almost all treadmills you will have option to change the metric.
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There is no reset button, the only thing you can do is unplug it for 10-20 minutes, if it is going to reset it will, if not you have a hard fault that must be addressed by a qualified repair person.