As a default, some classes, like the wizard, gain more xp than others. You could compare it to the way rogues and bards level up much quicker than other classes do in Baldur's Gate. Although the amount of xp you need to advance a level is the same in each case here, the varying rates mean that there is that difference.
You can view the exact details on standard xp gain by opening the xptable.2da file in your /nwn/source directory. This may be adjusted in-game so the values aren't exact values, or shouldn't be unless the xp slider is set at 1.
More relevantly, you can view the effective character levels for a class in the classes.2da in the same folder. Notepad can display .2da files effortlessly.
The files will tell you that, up to level 14, not every class counts as having the level it does. What it means is that at, say, level 4 (EffCRLvl04), a wizard counts as being level 2 (row 9). A fighter counts as being level 4, and therefore the resultant xp is much lower when facing a creature of the same challenge rating.
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