This is very interesting, but determining the cause is probably beyond the scope of the forums. I'd suggest logging a support case at support.landesk.com.
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Friday, I discovered a bug that's already been mentioned at https://community.landesk.com/docs/DOC-40464 :
BUG FOUND: v2016.SU0-4 - Cannot delete provisioning templates that contain Conditionals. If you try to delete, you get error "Can't delete the template". An empty shell of the template is left behind. It can be modified, moved, renamed, but not deleted. Cause: References in the database to the PROV_TEMPLATE_DEF_IDN are not deleted from PROV_ACTION_ORDER, PROV_TEMPLATE_GROUPING, PROV_TEMPLATE_REL, and possibly elsewhere.
So there's that.