Hi TE,
We aren't experiencing what you mentioned. For example, if I have five people logged into a hunt group and only one of them is on a hunt group call, a new incoming call will ring on all five phones, not just the four phones that aren't busy. If the person who's currently on a hunt group call would end the call they're on and answer the ringing call, they'll find that the call was coming from the hunt group they're logged into.
Hope that helps.