Front of toes or side of toes touch the toe cap? Laced or unlaced? There are a lot of variables to determine a correct length and therefore size. My go to to test for length is always this (it never fails) - take the laces out, pull the tongue right out (this is important to stop the boot from binding on the foot), put your foot into the skate and push forward until the "tips" of the toes brush the toe cap (ignore the side of the toes). Now bend slightly forward and see if you can slide a pencil down the back of your heel. If you can slide the pencil down then the skates are too long (at last a 1/2 a size) for what is considered a "perfect length" fit ie your toes should settle around 1mm - 2mm off the toe cap when laced up. If the side of the toe/s are pushing against the toe cap then that's not a length issue but a width and fit issue, you either need a wider toe cap or to get the toe cap punched.
1 size difference is a lot and whilst I think the scanner gets it wrong a lot of the time wrt to the fit, the length measurement is close enough most of the time. Your shoe size should never be used as a guide to your skate size, that's a fallacy that I wish the manufacturers and skate shops would stop using.