Hi @Camma5150,
Could you share a screenshot of your flow?
From your description, it seems that you have two Start an approval actions included in the flow. How is the second approval action configured?
Do you want to terminate the flow when you deny the request?
I have made the following flow, please check it for a reference.
When an item is created in the list, start an approval. Add a Condition, if the response is equal to Approve, start second approval to supervisor. If no, do nothing.
Add Condition2, if Response is equal to Approve, send an email to the item creator, then send an email to the first approver. If no, do nothing.
A screenshot likes below.

Best regards,
Mabel