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I’m confused

Return errors

Please have a look at the following sample report:
My unreturned 1st services: 17.
My unreturned 2nd services: 3.
These add up to 20.
How in the creator's green world is the number of return errors 19?
The opponent made altogether 15 unreturned services, however the final number is 13.
How are these number calculated?
Can you provide me with all the formulas how any of the numbers in the report are calculated?
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