I'm wondering why are my fingers feeling numb after carpal tunnel surgery?

It may be that: The amoujnt of nerve compression was evere and that it takes time for the nerve to feel better. It may be that the nerve was irritated by the surgical process and that the nerve is a bit more sleepy. In severe cases often it takes longer ( far longer than it does for the incision to recover) to exhibit improvement and at times full improvement may not be possible. Talk to your surgeon about this.

How numb?: Is the numbness worse after surgery? If you had an endoscopic carpal tunnel release, numbness can be exacerbated immediately post-surgery. Numbness and tingling should gradually resolve over a period of 4 weeks to 6 months, depending on the severity of carpal tunnel syndrome. Importantly, you should not have areas that are completely numb or insensate or "without any feeling" post-operatively.