Question about OnePlus 13

I am concerned about the quality of the price watcher data. As of today morning (07.08) it shows 825. It also shows that for the last couple days (including yesterday) the price has been under 760. But yesterday and within at least last 3 days I have visited this product page frequently and at no point the price was below 800 - but it is not showing in the price trend chart. I even have an email from yesterday saying that it is now available for 803 "As at 06.08.2025, 12:59" Why is that so?