What is going on with Haplogroup K?
From ISOGG Wiki
The Karafet et al (2008) paper made a major change to Haplogroup K. The subgroups formerly known as K1 and K7 was moved to M2 and M3, respectively, and K2 and K5 became Haplogroups S and T, respectively. Karafet et al discovered some early tree branching mutations in the islands between Australia and Asia which meant that some more recent parts of the tree were incorrectly named when these were inserted. These would theoretically cause haplogroup R to become K2b2a2. But half the population genetics research in the world has involved using the old names. So we inserted an alternate naming system for K and P which absorbed the new reality without affecting the well established names.