2-5 does have a lower ceiling, in the sense that there are very few items in the upper RIT ranges. So one careless error can drop the scaled score by quite a bit. Or one chance correct response can inflate the scaled score. NWEA recommends that a math score of 231+ on the 2-5 version should trigger a re-test on the 6+ level, remaining there for progress monitoring moving forward.

...pronounced like the long vowel and first letter of the alphabet...