Can not spend xp with advantage points at character creation

While creating a character, I’m trying to by the 5th and 4th levels in the Theo bell Loresheet at character creation. I may be doing something wrong, but I’m trying to use the seven points you get with advantages and buy 2 more dots with xp. I can’t find a way to do this. It is wanting me to spend the seven points in advantages first, and use xp separate. I think you should be able to buy the the 4th and 5th dot in the loresheet using 7 points from advantages, and buy the other 2 dots with 6 xp, but I could be mistaken.