I have the same problem and I use PC Firefox. It must be a common problem; I am using Mondly also for Arabic on Android and it has the same problem. So hopefully when one language program gets it working it might spread to others. I was like, but other language programs can do this. I haven't tried others, but apparently not. And my PC keyboard doesn't like to switch between Arabic and English in the same sentence in Firefox. So on both Android and Firefox I've seen the issue. It's only a matter of time before a fix is found and it spreads across programs.