I've done some research and I can't seem to find a solution to this issue. I started playing Old World Blues and I just entered the schoolhouse in the X-8 facility. As soon as I killed the first enemy I saw there I leveled up to 20. It did not let me choose any status increases or a perk. Killing anything else afterwards gave me no experience and it still says I'm level 19 in my Pip Boy. Is this bug well known? Has anyone else experienced this? I really hope there's a solution. I haven't made a hard save in quite some time, stupid I know. I really don't want to play through 1-2 hours worth of the game to get where I am again, especially if it happens again.