How does bunny events in derby work?

Someone who knows the details better than I do, might be able to better answer your question. But off the top of my head, I’ll try?

First, the number of horseshoe rewards you can get depends on your league. (I don’t know offhand how many can be earned in expert league.). The bunnies are a bonus to that.

Did your neighborhood perhaps finish early?

It’s possible to do all of your tasks during bunny times but still not “catch” them all, if you finish before the next bunny appears in the game.

When I first started, I didn’t realize that once you complete enough tasks to catch a bunny, further “bunny time” tasks don’t count towards the next bunny unless it has already appeared in the game. There is a set schedule for the bunnies, and tasks completed before the next bunny arrives don’t count towards it. (They’ll still show up as completed bunny tasks if you did them, or selected them, during a bunny time.)

I still like to try to do all of my tasks in bunny times if I can, just because I find it cute, lol. And it’s fun if I can prep tasks and just zip them off when bunny time arrives. I have had derbies where all of my tasks were bunny tasks. (But that doesn’t mean we automatically get all three bunny rewards, because we haven’t waited until the last bunny appeared on Friday and done the required number of tasks then.)

So essentially, if you want to “place” in a bunny derby (or sometimes get promoted or not get demoted) you may have to give up the last extra bunny reward because you can’t wait. If you want the extra bunny reward, you wait for it and hope the other hoods are doing the same, otherwise you lose your competitive advantage. It’s often a choice between one or the other, sadly.

It's as MommySnooks 🐯 said, you completed bunny tasks before the last bunny showed up. It will still show the bunny icon in your history but won't count towards catching the third bunny.

First bunny shows up Tuesday, second one Wednesday, and third one Friday. Idk exact times except for Friday, it's 1-1:30 pm (I'm in Central time in the US). It's possible OP did something like take tasks during bunny time Wednesday or Thursday and complete them, therefore showing in history with the bunny icon but not counting towards that third bunny because it doesn't appear until Friday. My neighborhood always waits until Thursday or Friday to start so we avoid that issue and have time to prep production tasks.