[Celjabba]

It look like you have the Half-Stat Default alternate ruleset enabled.
Tools -> Options -> Data Sets (tab)


Edit : also, from the FAQ :

there is a file in the GCA install folder called gca.ini which saves all the Program Options you've set for GCA. If this file becomes corrupted, either as a result of running the Program Patch or due to random operating system errors, it can cause program crashes or lockups. Deleting this file will reset GCA to the default Options, but will often times solve seemingly random program problems. This file is *NOT* deleted when you uninstall GCA - you have to delete the file to actually remove it.
To automatically delete the file (along with sheetoptions.ini, which saves your Character Sheet preferences) you can run the GCAClearAppData.exe which is normally located in your GCA install folder:
C:\program files\GURPS Character Assistant 4\GCAClearAppData.exe
In 64-bit Windows (7 or Vista) it should be located here:
C:\program files (x86)\GURPS Character Assistant 4\GCAClearAppData.exe