eBay Seller... sent ME an offer? huh?

I've been eyeballing a lot of some specific SSDs, considering snagging them. I have not messaged the seller, marked it followed, or anything like that. I've just kept the page open in a tab and periodically refreshed the page. Now I am logged in mind you to eBay.

I just noticed now though that the seller sent ME an offer. How did they even know I was watching??? What's going on here?