Unknown Web browser history

I have a load of internet sites on the history of my ipad that i did not look at. I am the only one who uses it. My daughter has cleared them on a number of occasions & has changed the log in passcode to my iPad & even changed the passcode on the web network to try & stop unauthorised usage but it’s still happening. I have iSO 11.4. I’am at a loss as to why this is in the history and was wondering if some one on my street could be hacking into my ipad and leaving this history trail???