The Additional Lore skill feat appears to be broken. I selected it as a rogue, and 4 major issues popped up: 1) 4 unnamed lore skills appeared with legendary level, 2) Lore name could not be changed, and 3) it totally messed up my skill training. My available skill points went from 8/9 to 4/9. I had to untrain every skill to be able to properly distribute training. 4) In the end, the lore skills—all 4—ended up untrained, unable to be selected for training, and provided neither a trained bonus nor my intelligence bonus (+2).
Thanks for reporting! We have another pass planned for feats on the roadmap.