Because it is a propositional part of a section. The SE 1/2 would have dimensions of 5,280 M/L x 5,280 M/L x 7,467.05 M/L. The E 1/2 of that would have dimensions of 2,640 M/L x 2,640 M/L x 3,753.52 M/L x 5,5280. SE 1/4 of that would be 1,320 M/L x 1,320 M/L. NE 1/4 would be 660 M/L x 660 M/L. E 1/2 of that would be 330 M/L by 660 M/L.
All dimensions are more of less without an actual survey by a registered land surveyor and then there could be mitigating circumstances that could affect those dimensions. As the section was being surveyed 150 years ago, the survey crew got confused and miscounted their chains so the section is actually 5,260 x 5,280 or a non-registered individual decided to reset a section corner by using his 100' fishing line and set a section corner in the wrong place and every one since then has used the wrong section corner. Or some electrical engineer decided he was a college graduate so he know more about surveys from one semester than the registered surveyor who spend eight years in training and education, plus twenty years experience and decided to reset all the section corners--and some of the following surveys used those mathimatically correct but wrong procedural per the US GLO requirements section corners for some of the legal descriptions. Etc, etc, etc, etc. There are skippys in the survey profession too!!!