Flags campaigns spending a large share on people outside the area you're targeting - common for local-service clients when location settings are too loose (e.g. "presence or interest" instead of "presence"). The fix is usually tightening location targeting or adding exclusions.
Out-of-area spend threshold - the share of spend going to people outside the targeted locations that triggers it. Default 30%, adjustable 5-75%.
Checks weekly; 7-day cooldown per campaign.