Why can't the humidity be maintained? Why can't the humidity be increased? For example, it can be kept at 56%

Why can't the humidity be maintained? Why can't the humidity be increased? For example, it can be kept at 56%

To confirm the issue in detail, could you please kindly provide the following information for our check?
1. Is this humidity ees on the hygrometer in our machine, or is it the hygrometer you put yourself? The detection range of all cigar cabinet hygrometers is 60-80%. If the humidity inside exceeds 80%, the detection may be inaccurate and the humidity may be displayed at 100%.
2. What is the ambient humidity? Generally, the humidity in the cigar cabinet can only be 10-20% higher than the ambient humidity after adjustment.
3. How much humidity you want to achieve?Humidity can be increased by adding water or using corresponding humidifier.
5. If there is no problem,we can replace the hygrometer to solve this problem.
6. This is not a product defect, because our product itself does not have the function of controlling humidity and can only adjust humidity through external conditions. The only way to do this is to turn off the refrigeration first, as refrigeration reduces humidity. In addition, wipe the inside with distilled water to increase the internal humidity, and continue to put the humidification bag. Choose one with high humidity.