Symptoms
Workflow history in sharepoint was not showing all workflows executed in the environment.
Diagnoses
n/a
Resolution
Not every workflow is meant to appear in that workflow history section you are working with. The design of that page was not meant as a report but rather as a way to manually start processes for a given SharePoint item. The instances shown there are strictly limited to only instances started directly from that page. So if for example you start a process with something like a button click from a form it will not appear in that workflow history section by design.
