Classifieds listed , turns to "draft" after specific time period

classifieds are published as per normal.

After a specific amount of time, they unpublish and become
"Drafts "

FYI :

Taxonomy
I have deleted the "expiry" taxonomy as there is no need for it.
( could this be the problem ?)

Classified status options
I have only enabled " publish " and disabled "Pending review" and
" Draft"

Please assist urgently, as published adverts are reverting to drafts.

Please additionally also check test site as well http://www.crestviewvet.co.za/wp
for the problem.