School administrators mean well--honestly they do; but, they only know the law as it relates to public school students.  Too many times, I have heard stories of overzealous administrators requesting parents provide more documentation than is legally required (like telling a parent that their child couldn't be homeschooled mid-year or that "your child has to be coded as a DropOut because you aren't enrolling her in another school".  
New homeschool parents are often easily intimidated because everything that we learned about education was taught to us by a public school frame of reference. Two people can read the same law yet interpret it very differently especially when the two people are operating from two different frames of reference. 

Here's one mom's experience with The Show Me Letter: https://www.thehomeschoolmom.com/the-show-me-letter/