Immigration New Zealand Skilled migrant - Health Issue

Could any one please clarify me on this, I have applied skilled migrant residence visa in June 2019
CO assigned today and worked on my case
CO mailed that

I am unable to finalise your application today because I am waiting for your partner’s medical outcome. We can defer her application if we are satisfied she meets all the requirements
There are some abnormalities and previously only assess for temporary application.

and another email
Before deferring her application for 4 months, I must satisfy she meets all the requirements. If not I am unable to decide your application.

Any idea, whats happening?