I think there are 2 possibilities in that way with mood stabilizing type drugs, where either it can be too much and actually make you numb, or it can just be doing its job and just feel odd at first because you're used to more extreme emotions.
If it's too extreme or proves to be too bad after a while you might actually need to adjust meds, but I think from your post I'd guess it could very well just be the second possibility.
I'm on Lamictal and I dealt with similar feelings at first, and I remember I just had a constant feeling of boredom for a while. It went away though and now lamictal really helps. For me personally the numb feeling that was strong at first wore off, and the more stable moods last but after a bit it stops feeling as different and noticeable and strange as it does at first, and just feels natural. I hope it works out for ya!