Depending on your hair length and your scalp's particular pattern of growth and shedding, you might have your thickest measurement almost anywhere on your head and it might move around. For a while, mine was on top of my head near the front hairline. Now it's on the back. There's no wrong place and nothing to worry on as long as the measurements don't fall off really fast, like losing an inch circumference in a month or whatever. I'd even call 1/4 inch a margin of error honestly because it can depend so much on everything down to how much conditioner stuck to my hair after a wash if I didn't rinse thoroughly.
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