What would cause a life event which doesn't change Health coverage to drop a dependent?

Summary

What could be checked to see why a life event would keep the coverage tier but drop the dependents?

Content

I created a life event that allows two changes only - one to change one's HSA eligibility (yes/no question) and one to change basic life insurance beneficiary(ies).  The event restricts enrollment to just those things but then drops the medical/dental/vision dependent(s) but keeps the coverage tier.  For example, the person still shows coverage Employee + Spouse but the spouse is dropped under the dependent section.  Any ideas why and what to check would be greatly appreciated.