Seller refunded with no explanation

I purchased an item this morning and an hour later the seller refunded me with no explanation. I’m not sure how to proceed, do I leave a review or not bother leaving one at all?

I reached out for an explanation and haven’t received a response. I’d feel bad leaving a negative review because at the end of the day, it’s their item and they’re not obligated to sell it to me, but it feels rude/unprofessional for them to simply cancel the order without a word. Thoughts?

Thanks in advance <3