Check your Google Ads keyword match types

Because it's being reported that Google has automatically changed some Exact and Phrase match types to Broad when advertisers switch to conversion-based bidding.

Even "Exact" match is no longer very exact, and Broad match is very broad. Changing to Broad match can dramatically increase numbers of nonconverting clicks for which you're paying, increasing your ad spend while reducing your return from it (ROAS).

Google Ads Product Liaison Ginny Marvin said in a tweet:

"That is not the expected behavior when switching from manual bidding to a Smart Bidding strategy. The team is investigating this issue."

In the meantime: check your match types.