Screen cap 1.
Before index modification Status is empty OR not empty - meaning we don't care what status is.
After index modification: If Status is Assigned to Tech or Tech Exam Delayed.
Therefore, because you have said the Status can be anything to start with, but as long as Status is Assigned, or Delayed after the index change then the workflow will trigger.
What id does NOT mean is that the Status field has to change to trigger. Any field change will cause a Trigger because your Trigger condition is too loose. Clipping a document to a document that meets the criteria will Trigger because the DWMODDATETIME has changed.
Your other 2 Trigger conditions have a similar problem.
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