And it won't be. The only thing that is possible on our side is to disable the audio exercises, so no one gets the 'type what you hear' exercise :/
Wondering why this sentence is in a unit on food. Polish cuisine has become experimental? :-)
This was actually in the original version of the gospel of John. This is what Jesus fed the multitude. Turns out that cats and barley loaves sound very similar in Arameic...
Yeah, and it's one of the weirdest audio problems I've heard here... But the only thing we can do is to disable the audio exercises, and it has already been done.
One fish, lots of fish. He/she/it fishes They fish The fish are/is swimming
It's actually "dwie ryby", and „sześć” (and „pięć”, but I guess you can't type „ć”).
But back to your question: the short answer is: that's how Polish works. If the plural (bigger than one) number ends with a digit between 5 and 9 or with 0 or 1 (except when it ends with digits 12, 13 or 14), then the nominative changes into genitive.
The long answer would possibly involve the story of how the old dual number got merged into plural with some remnants left behind.