It is, and I can see what's happening. The bot checks each users blog and looks at their most recent post, if this post has already been upvoted, or payouts are declined for that post, that user is skipped. Scanning two posts deep would make scanning 2x as long...
Looking at your blog, I see a pattern of post, then copy of post with payout declined... Perhaps you could delay this second copy until voting has had a chance to happen. Upvote rounds happen hourly. On a positive note, you have been building up a decent balance for your next upvote.