Keybr rushed me through a ton of letters but now is stuck on 'J'

[Watermelon]

Trying to learn Dvorak and the algorithm behaves in wildly different ways at different stages.

At first, it forces you to master E N I T R L. While one would expect it to start with the home row (A O E U H T N S), Keybr's approach here isn't something to complain about. It then adds a new letter now and then based on accuracy and speed. So far so good.

However, somewhere in the middle the algorithm begins to add letter after letter with little regard for mastery, often after single lessons, without giving you the chance to even memorize their positions.

And then at the end, it insists mastery of the uncommon letters Q and J, which leave you exhausted and increasingly frustrated, more so when you try to type an email and realize that there are quite a few keys you have forgotten thanks to hours spent typing words like "exquit" and "rejointron".

This is where I am stuck - on the letter J, for the last three hours - and this is where I say thank you very much Keybr, but you're broken.