Watch out - iPhone bug allows access to deleted pics by tricking iOS into letting them at content that shouldn’t have been accessible.

Solution -
In the list of Albums, you’ll find one called Recently Deleted, permanently deleting them from tit  puts them beyond recovery.

https://nakedsecurity.sophos.com/2018/11/15/thought-you-deleted-your-iphone-photos-hackers-find-a-way-to-get-them-back/