IPhone advanced website data?

So me and my fiancé where trying to look for settings on his phone, I had a look for him an came across iPhone website data this showed a list of websites and had adult friend finder on there. Although it wasn't in his normal history. I asked him if he had been on it an he said no. But why was this in his advanced website data?

If you have an iPhone please go to settings, safari, advanced website data

Is there any sites on here you haven't visited but listed? Please tell me cause I'm worried he is on adult friend finder

I have an iPhone and sometimes that pops up while I'm on other sites. It was most likely a popup

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