Unable to access website on 2nd or 3rd compute instance (with same VCN & subnet as 1st instance)

Summary:

Unable to access the website on newly created compute instances. Works fine on 1st compute instance

Content (required):

The newly created compute instance shares the same VCN & subnet (and security lists) as that of the 1st compute instance. I am able to access the 1st instance from the internet without any issues. However, I am facing issues with the subsequent instances where the security list is not getting applied (i.e., I am not able to access these servers on http/port 80 TCP from the internet)

I have disabled firewall on the compute instance to ensure that the firewall is not blocking anything.