Mobile IME input glitch

When using a mobile IME to input Japanese, words ending with び or ぴ such as みやぎ require you to type き and then add the " mark. However, after typing き, Memrise accepts it as an answer and considers it an error. This means I’m getting answers wrong where I’m actually just trying to finish typing. Hopefully this makes sense.

Is there any way to workaround this or request it to be fixed?