AdobeSign Dropdownlist With Signer

I created a dropdown list using Aliasing.

Select Gender: {{$Gender}}

{{#Gender=Gender_es_:signer1:dropdown(options='Male,Female')}}

Sent email to 2 people.

Signer1 sees the dropdown list prefectly. I haven't signed this doc yet.

In the dropdown I see, the following options: "Select...., Male, Female" ---- Select option is added by default.

Opened Signer2 email, the document has Gender as Male (though signer 1 didn't select anything yet)

After some research, I found AdobeSign just showing first value in the dropdown instead of showing blank. How should I fix this?