Thanks for the feedback.
I developed pretty quickly that tool, and that may be down to that reason for what you experienced.
I wanted the player to get a glimpse of their roll, to see how many 1s they rolled. And by putting the ones directly in the "stored" part doesn't fill right. I could do a transition, but my html/js skill is a little rusty on that part.
I will see if I can enhance this however, and I add it to my todolist, as well as the confirmation of the reset. Anyway, the code is open on github : https://github.com/Gulix/wretched-dice/issues
And I happily accept Pull Requests and Issues for ideas