Welcome to Android Central! To what website are you uploading your photos, and where are you seeing the photos you thought you deleted? If you're talking about uploading your photos to Google+/Picasa, then it might be due to the phone doing immediate Automatic Backup to Google+ of any photos you take. Therefore, if you deleted the photo from your phone, it would still have been uploaded to Google+, and you would therefore see those "deleted" photos in your Google+ albums.
To turn off Automatic Backup, go to Settings/Accounts-Google, and select your Google account. Uncheck Google+ Auto Backup. You'll have to make sure your background sync is on in order to uncheck it.