I think I might have had something to do with that one.
I’ve definitely changed my mind on some halachic issues – mist on subtle points, one or two not so subtle.
I’ve also learned which issues are very sensitive points to some people, although I don’t know if I’ve actually changed my mind about too many hashkafos. My hashkafos have been pretty well thought out from before I ever joined the CR, although discussing/debating has helped me crystallize them.