from there: Indeed, you should know that as they are four Olamot ABYA in Kedusha and their Shoresh is only Eser Sefirot that expand in them sort-by-sort and degree-by-degree, so it is in ABYA de Klipot. They are all rooted in the sorting of the Melachim that could not be sorted, and they are eleven Sefirot.
It is written in the Zohar (Parashat Truma p.164), “The Sitra Achra is given an extra count, and it is counted as a deficit, such as eleven.” It means that when it is given the extra count, it is a demerit, since they are ten in Kedusha and eleven in the Klipot.