Ancestry automatically keeps living people private, but I suppose this isn't exempt from software glitches.
People marked as “living” in family trees are not visible in searches at any privacy level. Living people are visible only to the tree owner and to anyone the tree owner invites to the tree and authorizes to see living people. If no death information is provided, people under 100 years old are considered to be living. If your tree is public, the only way to make someone private without making the whole tree private is to mark them as living.
If you upload files to a public tree that you later make private or delete, your files may continue to exist publicly or privately on family trees of people who saved them to their trees during the time your tree was public.
More info on here:
https://support.ancestry.co.uk/s/art...y-Tree-Privacy