The url for the site would be down in the the adress code. You did not show enough of the ad code for us to know what site it is.
The forum is mine.The site advertised is unknown for me.Should i contact google ?What a strange add ???
What strange about this? Google encrypts part of the URL, there's nothing new there. You should be able to select that URL and keep going further, revealing the rest... if that makes sense. There's more to it.
i had seen some ads like that with no ads by google appear on it in some site but it change randomly some time the word(ads by google) appear and some time disappear