Talk:Gameplay:Summoner Level/@comment-113.187.17.223-20150819191821/@comment-112.210.29.135-20150819203335

^Oh wait, nevermind, they actually did fix it.

http://forums.gumi.sg/forum/news-boards/235972-advisory-missing-10-cost-issue

Apparently, you'd just need to gain a level after having lost the said increase.