Azure FHIR API Issues

I was able to successfully set up connection to Azure FHIR API. I posted a sample patient and was able to retrieve (get) that info with no issue. However, when I post a another sample patient and try to retrieve a specific patient (e.g GET /, both sample patients are retrieved. If there is anyone that has some experience leveraging Postman with the Azure FHIR API, I would greatly appreciate being pointed to some additional resources to address this as well as any other relevant information that could assist me with issues like these. Thank you! JB