I have been using sharepoint designer workflows to send an email to a particular group when a requester fills a form in my sharepoint site. the problem is some other groups are even getting emails although they are not present in my designer workflow. so can someone help me to fix it.
Assuming you selected proper SharePoint group already, one potential option would be that within the SharePoint Group there are not only AD Users but also AD Groups having email address configured for them which would automatically function as a Distribution list basically sending email to all members.
Check youe email string, verify your email group and confirm they are not part of that group