Is it correct to have adgroups for a singular & plural exact match keyword? My campaign is setup with SKAG but i noticed today that one of my ads was showing for the wrong search. For example a search for [running shoe] showed an advert from my [running shoes] campaign. I thought i had the exact match as a negative in each campaign to stop this happening but form some reason one of them is now missing and when i try to add it again it says i cannot negative a keyword i am targeting, even though i'm not targeting it in this adgroup. Has google changed something? Thanks!