[Google Ads] Improve negative keyword management

Our site sells silver jewellery (pendants, necklaces, earrings) with a primarily Scottish/Celtic theme. (If you look up "Skye Silver", you'll find us, don't know if I can post external links here). I started a shopping ad for all products, and it's still in the "bid strategy learning" phase (few days left). It's delivering, I'm getting impressions and clicks, but so far not a single conversion. However, when I go to look at the search terms that people are using, and sort by impressions, I see that the top one by far is for "sea urchin". *REALLY?!?* Why the heck is it promoting that? Yes, we do actually have a sea urchin item, a small silver casting (not an actual piece of jewellery, just a collectable sit-it-on-your-shelf sort of thing), but nobody ever buys it and it is most definitely *not* a product we want to focus on. From what I understand, I can tick any search terms and then add them as "negative keywords" to prevent it using them, but I'd like to know why on earth it thought to focus on this initially! https://preview.redd.it/ilhnztqa64pg1.png?width=1042&format=png&auto=webp&s=8cdea260e4ef42195359bcbdb8411441c677a542