X is measuring the new Home Timeline verified impressions on a rolling 90-day window. The logic is: Current 90-day total → oldest qualifying impressions expire → new qualifying impressions are added → the total can rise or fall. I don't know, but I think this is what they are doing... Today's total = impressions from the most recent 90 days. When a day drops out of that 90-day window, all the qualifying impressions you got on that day are removed from the calculation. For example: Previous 90 days: 499,800 impressions. You gain another 20,000 today → 519,800. But tomorrow, the impressions from Day 1 expire. If Day 1 had 68,600 qualifying impressions, your figure could suddenly become roughly 451,200. So, you haven't necessarily lost 48,600 impressions. Those impressions have simply aged out of the 90-day window. Omorh...this is the only explanation I can think of sha...