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Completely different numbers

Hello!!! I need the help of experienced and not very arduino players. I am doing a project. Money box. The project consists of a tweeter, 4x4 matrix keyboard, LCD 1602 I2C, as well as Arduino UNO. I've already done everything except balance. When I enter the number to be added, then I have a completely different number in the balance! Help me please. I am writing here for the first time, so I don’t know the etiquette :)
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With such questions it’s better to Thematic Forums.
Here hardly anyone will tell, and there are no psychics to solve the problem without seeing the code.

We advise you to read:

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