Why do I see a product with status out of stock but with stock units available for a time period?
Status out of stock for a product means that this product was at least once not available for the time period we analyze.
The stock units of a product on the other hand refer to the stock available on the last day of the analysis.
Therefore a product with status out of stock but with stock units available means that this product was at least once not available, but in stock the last day of the analysis.