Q: My iPhone 5s wont let me delete my photos

My iPhone 5s isnt letting me delete my photos. I have copied them on to my laptop and ticked the box to delete after importing but they havent deleted. I have tried to individually delete each photo and they appear back in the library once i exit the photo app.

When I copied all photos to the laptop it told me that some couldnt be deleted as they were protected or there was an error with the photos, but it turns out none were deleted after import. I dont know how to protect them so I fear its a glitch in my phone. Any ideas? Thank you