Currently, the Myndbend Process Manager will stop the process of approvals if an approver, in sequence, has denied. The assumption is the approvers further up in the chain would not be asked to approve if one if the initial approvers has denied the request.
However, some workflows require the process of approval requests to continue regardless. If this is your requirement, you will need to enable the setting "Check to add next approver in sequence regardless of denials" in the app settings (Apps > Manage > Myndbend Process Manager > Settings > App Configuration tab).
Also, you will need to edit your "MPM Process Sequenced Approvers" trigger to check for the "approval_denied" tag.