Hi! I'm a lv. 134 player but some of the girls of my harem can't be upgraded above lv. 130 or 133, they're listed as "maxed" in the shop panel and I can't add any book but in their harem profile the exp point left to reach the next level are marked... is it a bug or is there something I miss about game mechanics? maybe because there must be an average level of all the harem girls, for example I have still some girls at lv 1 others at level 100 or 80 etc.

Thanks in advace for your advice.