China Empire - 1 Cash Anonymous Kaiyuan Tongbao; without mark [επιλυμένο]

Hi, i have an issue about the coin in the subject

https://en.numista.com/catalogue/pieces20604.html

In the page is reported:
Early types (621-718): the middle section of Kai (開) touches the top of the hole.
Middle types (718-732): the middle section of Kai does not touch the top of the hole...
Late type (732-907): the middle section of Kai does not touch the top of the hole...

But in the Hartill catalog is stated the opposite:
Early types (621-718): the middle section of Kai (開) doesn't touches the hole;
Middle types (718-732) and Late type (732-907) the middle section of Kai touches the hole

Is it a mistake in Numista catalog?

Most probably an error in Numista

This is indeed an error, and I amended the pages. Thank you very much for noticing this.