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Discrepancies in the "Additives" section - do these indicate a mixture of two different types of oil?

For years we have always been using an oil from the same manufacturer with the same name and specification to lubricate our systems. It is regularly monitored with trend analyses. Oil changes are carried out on the basis of the suggestions of OELCHECK tribologists in the laboratory report. We have never noticed any abnormalities. However, the latest laboratory report now shows discrepancies under the heading “Additives” that do not fit with previous analyses or fresh oil.

Do the changed values indicate a mixture of two different types of oil?

What other reason could there be?
 

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