Why Is Facebook Putting Almost All Of My Advantage+ Budget Into 1 Ad?
Edited
It's totally normal for Facebook to spend a majority of budget on one ad in your Advantage+ campaign. Facebook uses machine learning to pick the ad that it thinks will perform best when shown to your audience.
Typically, we see 80% of budget go to one ad in the campaign, and the rest of the budget split up between the other ads. The only time we shut off an ad in an Advantage+ campaign is if Facebook is giving it a majority of the budget and it is severely under performing.
Just keep in mind, Facebook also takes time to find the right audience for the right ad, so don't tough your Advantage+ campaign within the first 4-7 days of launching it to allow Meta's AI to learn and optimize.