Chroax - Profile

At first the story presented was quite interesting even though it was quite cliche and I decided to continue reading it. But more and more I realized mistakes like how the author presented mc stats. I don't know how the author does the calculation for stats. for example mc just raise lvl from 4 to 6 with 22000 exp (before). While 23000 exp raises 6 lvl when mc himself has a higher lvl than before. Another example is how author calculate free point stat mc gained from skill. So for me if the author wants to present a story with a frequently mentioned stat. The author must be able to calculate accurately the progres of mc stat. [SPOILER BELOW] And how the background of the world is explained is quite simple by presenting that everything about things like monsters and other information is available from the core dungeon