@lottobot will hold over posts that are entered into a lottery within the last 30 minutes of its runtime until the next lottery. So your post was not entered into the lottery you highlighted, but into the next one, which as you can see has two other entrants as well. @lottobot is a lottery and is not guaranteed to upvote your post, rather it chooses randomly from among the current entrants in its lottery. This is all explained in detail in the introductory post.