arduino counter with lcd display pricelist

Hello, I am having a problem programming a counter that can be reset to 0 to be displayed on my LCD. The counter works fine when it is still in its one"s digit, but once it reaches 2 digits and I reset the counter, there is a problem. When it reaches 2 digits, for example 10, the LCD keeps the second digit, meaning that when I restart my counter, it reads 10, 11, 12... . Elaborating on the problem, when I stop the counter at 11, it holds the 1 digit. This means that when I restart the count, it displays 11, 21, 31 and so on. This is my code as for now.

When I decided to make a speedometer with Arduino, I googled around and immediately found this project by John Boxall (seehttps://tronixstuff.com/2011/06/22/tutorial-arduino-timing-methods-with-millis/), that unfortunately did not include circuit schematics and wasn"t tested with an actual reed switch.

I adapted it to a different type of LCD display and tried unsuccessfully to implement hardware and software debouncing - unfortunately, quite often the interrupt is called twice, because the magnet causes a second raise in voltage while leaving the sensor - in that case, the speed will be doubled.

5) user press key "A" again and "newPrice2" is saved to EEPROM after a small delay on LCD there is a "PriceList" again with 4 prices but with "newPrice2"

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