Purchase costs are up 5% and average order value is down 4%, bringing ROAS from 3.40× to 3.10×.
Return fell from 3.40× to 3.10×. The account comparison shows two pressures on the result: Spend $4,228 → $4,820. Meta-reported purchase revenue $14,365 → $14,940. CPM up 12%; cost per landing-page view up 15%. These comparisons explain the arithmetic, not a proven cause.
Compare cost per purchase by ad to locate the increase. Then check whether spend shifted towards the more expensive ads.

5.10×82 purchases
4.05×143 purchases
3.30×30 purchases
