Bug with dead or alive event

I was only given tier 3 rewards but I had maxed out the dead or alive event and was tier 1 I hope to get my full reward.

Me too i got just 800 coffee even i maxed the points and got the top tier
Please resolve this issue

This isnt a bug this is how the event works. If you click the I icon you can see that the odds of you getting specific tiers at the end of the event are random, getting higher in the tier reward only increases your odds.

I wish theyd say on the main menu of the event cause i end up having to explain this to new players on the forums every single event but getting max rewards isnt guaranteed, it is random.