No Foldable and 60v Voltage electric scooter price

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Dear ,
I am Tibor Kovacs from Hungary, and I am writing to ask your technical help.
I just bought a WYZMC008 type scooter from the Aliexpress. It is a 60V 1500W motor configuration.
My problem is that the LCD speedometer shows wrong speed value. For example, when a drive 20 Km/h, it shows about 40-45 Km/h. The maximum speed, what shows 65Km/h however I drive about 35 Km/h.
Do you have any idea, what is the problem? What would be the solution?
The speedometer shows only the battery level and the speed. Is it normal? As I see, it could be shows the front light On/Off, and there is something Clock pictogramm as well.
I am looking forward your kind answer and help.
Best regards, yours faithfully,
Tibor