I checked your downvotes. To be honest, I wouldn't worry about the ones less than 0.01SBD that's less than a penny and usually just disgruntled users, troll accounts or bots upset with you tagging their tribe or signalling.
However, I did notice one large downvote from smooth. I didn't look too closely but it looks like he may have either thought you used bid-bots or promotion services for your post or he is downvoting someone who voted for you for some other reason. I suggest you tag him in that post and ask for more information, especially if you didn't pay for bids.