Sometimes the summary of the Speed Review shows words in the summary that were NOT tested. It’s always after a wrong answer. But it doesn’t happen always. If the result is that some words are not tested, but still marked as reviewed, then it impacts the learning experience.
Additional Symptom: When doing the Speed Review, it sometimes possible to notice that after a wrong answer (still during test), the screen quickly refreshes twice after a wrong answer, as if the question immediately had been answered correctly (but it wasn’t in fact answered). In all these cases, after the wrong answer, an extra (not tested) word shows up in the summary.
It’s on Android, with Memrise App downloaded about a week ago. I had it also with the version downloaded last summer (if I reported this before, sorry, but I couldn’t find it).