It seems they don't know you already bought it, which... maybe they don't and do you want them to?
that’s literalist what they know. it’s called retargeting and it’s the point of these ad systems, to track what people buy to understand how to link buying patterns to other info about people
If I buy a car, I get flushed with ads for cars. Really. Same for an area rug, a vacuum cleaner, and many other things I will never buy two in a row of.
That's just stupid.
This happens on places like amazon too, that know I bought a toaster, then show me sponsored results for 50 more toasters.