Some code bug on mobile app with symbols

I’m currently on Korean 1 course and noticed that a letter ‘h’
is differently coded on computer and mobile app. Which is bad if you’re learning Korean, because
you can learn it wrongly and not recognize your mistakes.
It’s not just letter ‘h’ itself but formed with other symbols too.
In attachment it’s showing how it looks like on the app and the website.
Please fix this, so there aren’t any other confusions with symbols, and also, the progress you do
whether on app or site, it’s not synced. If I learn on the app, on the computer I do the same lessons and vice versa.

I have written here ‘extensively’ about a bug with Korean single letters.