The microfilter has not been correctly inserted back into the filter combination after cleaning.

Correctly insert the microfilter back into the filter combination; see figure.
There is soiling on wash items and/or in the wash cabinet of the dishwasher. The dishwashing results are not good after the filter combination has been cleaned; for example, there is soiling on dishware items and in the wash cabinet (G 7xxx).
Correctly insert the microfilter back into the filter combination; see figure.