Why removed synched photo folders still appears on my iPhone 5S
This happens from time to time. Not just photos but other files and storage. The cure is the same routine for all of the various situations like this.


Unpair your watch if you have one or more Apple Watch
Back up your phone
Erase all content and settings
Restore the backup
Set things up that didn’t get backed up by design - Touch ID, Apple Pay, pair watches, etc...


You can use iCloud or a passcode to get personal details (health data) and network passwords part of the backup.


https://support.apple.com/en-us/HT203977