When I’m usuing my calssic review option it happens that if I put wrong answer (doesn’t matter if it’s in English or japanese hiragana) and after that I get another word which I have to put in japanese, despite I give good answer, it disappears and the word is refreshed waiting for answer. I have to put it few time (sometimes even 7) for course to let it through and accept it. This doesn’t happen if I use english alphabet, only hiragana.
This problem is not presented on mobile/tablet app but probably mainly cause I use those hint parts which are under. Problem is on Chrome browser with WinOS, but in LinuxOS with same browser everything is ok.
You should’ve gone to the bug reporting section of this forum, where you’re more likely to get a reply from @MemriseSupport.