If I understand correctly, you've setup a workflow where you have multiple approvers getting the same approval notification at the same time, but only 1 person needs to approve. If this was the case, you had to alter the standard condition and made the step where the document is released to Always run. The problem here is that the standard response expects the pending approval condition to be zero hence it doesn't run a critical step "Approve the approval request for the record." What this step does is, it'll go through each open approval entry for the record and close them out as if approved. This same step will also notify the approver that the record has been approved. Edit your workflow and add the missing step to the line where the release document resides and you should be good to go.