Hi @KendallJONES,
I'm going to paste a post I just wrote for someone else on this same topic...
All areas of Canvas, includingRubrics, allow for decimals to be entered, so that needs to be taken into Consideration (like, what if the teacher enters 3.01... Canvas does not do any sort of grade rounding). I'm including a screenshot here of a rubric set up with ranges.

Essentially what Canvas is saying for "Full Marks" here is that anything from 5 points to anything greater than 3 points will be in the "Full Marks" category. Anything form exactly 3 points to more than 2 points would be on the "Okay" category, and then the rest in the Needs Improvement category. This is the same way grade scales work in Canvas too. Everything needs to be explicitly defined for every possible option, including decimals.
I hope this may add a bit of clarity as to why the system displays in the way that it does.
-Chris