Problem with option of follower

What is a problem with a option of follower?
I like to click option of follower to follow some kind of sellers and buy interesting for me goods. But why signal of restock some goods is to late? Very often I faced with late signal (40 minutes after sold goods or 20 minutes after sold goods). So it seems this option of following some sellers is useless. Why it works that way? Maybe I do something wrong?

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