Earlier quoted context omitted.
All 3 models you ranked cannot get "how many r's are in strawberry?" correct. They all claim 2 r's unless you press them. With all the training data I'm surprised none of them fixed this yet.
LLMs think in tokens, not letters. It's like asking someone who is dyslexic about spelling. Not their strong suit. In practice, it doesn't matter much, does it?
It is evidence that LLMs aren't appropriate for everything, and that there could exist something that works better for some tasks.