Custom field looses value

Custom field looses value

Hi, we are using custom fields to enter quotation prices and repair costs. This way we can compare the total quotations price compared to the repair cost and calculate our profit.
The problem we encountered is that some incidents loose the values of this custom fields. This is a major issue since we used this report to calculate the annual bonus of our technician. Now we cannot trust these results and have to check every incident manually. Is this a known issue and is there a solution?

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