AWS Sticky session cookie not working

Question

I'm using an application load balancer with the target group of two instances. In the target group, I have enabled application based cookie. However whenever I test the load balancer, it keeps switching to both instances. (I have put IP address on each instance, so I can see that it's going to both instances). Shouldn't it go to the same instance every time? How can I fix that?

Here's how I have set

Here's what I see in the target group attributes

Cookies in the browser