For a bot which curates (instead of sending tipping tokens), it's technically impossible to curate twice on the same content using the same Hive account, unless the person who wants the post to be curated again decides to just to increase the percentage of the curation (or vote again in case the Voting Power is already at 100% and the account curating has made a significant Hive Power Up), by which the previous curation gets forfeited for both the curator and the author's content being curated. 🤓 This problem can easily be solved if the curating bot has alt accounts which can vote more for the selected content. 😏