I would hardly call 10, 5, 7 & 3 a large count. Are you talking the jump to $448 for the 2500sf homes? There's only 3 of them. It makes complete sense, you jumped from not so small sample of 40/60 mix of 3/2s and 4/2 to a pure 4/3 grouping of only three.
The 2200-2499sf range is $410, $439 and $428. That's a whole 7% spread, and based on the median for sample size of 5. The $448 jumps to the 2500-3000 group and happens to be just 3 homes, all of which are 4 bed/ 3 bath
You've got basically a random grouping and it's being distorted by small sample size.
BTW, that highest price unit in the top group is in backup offers. It's also the only one of three with a completed backyard.