Hello,
I seem to have broken and/or confused the site in 2 ways:
1. Learning about the shortstack strategy, I wanted to take another shot at the quiz. However, I managed to get the bigstack strategy quiz on the page where I learn about the shortstack strategy. I seem to have done something unexpected or wrong.
2. At the bigstack strategy page, at the bottom of the page there are some quiz games you can do to test your understanding of the material. However, for me, the quiz stays empty, with only the task ("Mark the 5 strongest hand combinations"), the score, the number of the task and the main menu button visible, however, I can see no cards.