the window that appeared in refine event is the continuation of last event ( maybe a bug )

I got a little more than 400 refining last time and didn't make the cut to get 500 rewards, and when I saw this event earlier than expected I already thought hat there's a bug in this so I tried refining 10 first then nothing happened, and then that's where I noticed the claimed *ons, but the last 1 is only written in claim. I saw the counter and it says 400+/500 so I think that's the problem.

Guys learn from the past like the fishing event, when yo see early events don't jump on it, inspect carefully first