I think if the lines are visible in access.log for 192.168.0.14, then its being cached, correct me if i'm wrong pls.
The access.log is purely for accessing the proxy, not whether it's being cached or not.
TCP_MISS means it isn't being cached (or at least, not being fetched from the cache), as opposed to TCP_HIT which means the request was fetched from the cache.
AFAIK..