Hello there! I was told this is the place to report this Bug in-case the development team has not seen it yet.

From what we have gathered, it appears on Linux Version of Disgaea 2 PC, if you create a Magic Knight and then level them up they immediately gain 40million Int.

From what I can tell this happens during the Character Creation screen. After base stat allocation, the following screen says your Magic Knight has 1 Int total, if you proceed to complete the creation then level them up to 2+ they turn into a 40mil int monster.
If you get to the 1 int screen then go back to stat allocation, then proceed again, they will have the normal int value shown. If they level up from here it appears to be fixed.

http://imgur.com/a/6yhPa - Creating new magicknight.
http://imgur.com/biBVUy4 - 1 int next screen.

http://imgur.com/BvbrH6q - 1 int with staff
http://imgur.com/OSHrXHg - 40mil after leveling


More info about this in our discussion here.
http://psteamcommunity.yuanyoumao.com/app/495280/discussions/0/133256055940517384/