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When an ad platform changes how it counts purchases, the chart goes up and the store doesn't. So take the 14 days before the change and the 14 days after, and put the platform's count next to your store's. You don't need to sign up to see your number.
The ratio is platform purchases divided by store orders. Nobody's ratio is exactly 1, because platforms count things your store doesn't. What matters is whether the ratio moved. If it was 1.15 before the change and it's 1.32 after, the platform's count went up about 15%, and your business didn't.
So I encourage you to write the old ratio down somewhere you'll see it, and read every report against that number.
Marketing S'mores is a free brief for media buyers. What the ad platforms changed, what it does to your numbers, and one 10-minute thing to do about it. No courses, ever.