I assume you have the Metacreationist and Psychometabolist traits? Otherwise there are some major bugs...
Well that is what happens when all raiding parties are in the same family. In a future Version (0.15.00), I will be able to arrange them so that upgrades should not place worse parties in place of better ones by mixing the various levels around. I could not do this in this Version because inserting the new raiding parties in the middle of the file would break savegame compatibility.