I have been noticing that when I do a trade and my wishlist is for 4 copies and I get 4 copies in a trade, my wishlist is not reduced to zero - it stays at 4. Has anyone else encountered this? I was just wondering if I had something configured incorrectly....

I have seen issues where your wishlist doesn't properly update if the cards only loosely match. If I am looking for an English NM copy (as specified on my wishlist) and I trade for a a copy that doesn't have a language set, or some other thing that won't exactly match my wishlist (maybe condition is unset?), then the entry isn't updated. I haven't been able to figure out exactly when it matches and when it doesn't, but there are certainly some edge cases that are slipping through.