Great Quiz! Maybe you need to work a bit on the border of the flags in svg, as a very thin line of map is visible, which gave me idea of colours and what flag could fit there. Anyways, Great Quiz, nominated!
Strange, it may vary depending on what you play the quiz from, as for me both mobile and desktop don't have that problem. I do know that if your internet is slow, it will load the flags first and then the rectangles, so problems are inevitable, unfortunately. Thanks for the nomination!
None, I actually copied another one of my quizzes to create this, as the only way to create clickable-map quizzes used to be to copy, hence the relic of a past quiz.
Thank you! It is broken on both mobile and desktop (both can now play this kinds of quizzes). All my quizzes with historical flags are constantly breaking (sometimes just a month after I fix them!)