
The artist wrote the 8 in a weird way, so it's possible to confuse it with a 6. You can see it in the raws and the translation from a different team who kept the numbers as they were written by the artist. So it is 185cm, which would fit with the barely over 180cm from the novel, if they made him a bit taller.
I think he is more than 2 inches smaller than Dane is in Desire me if you can, more like 3-4 inches. Because Josh was decribed as "small" for a bodyguard by Chase and he is the smallest of the group. And Dane is most likely around the hight of Chase ( i think he is 6'5" or 6'6"), because Grayson is taller than Chase.
So I think for Josh the 185cm are most likely correct.
It must be a typo or something. Bc in Dane's novel that recently released, his height is confirmed as 6'5 (Grayson fyi is 6'7"). In the novel "Kiss me if you can", it said, "Dane, who was 2 inches taller than Josh...". Meaning Josh is 6'3".
Either there is a typo or the author retconned Josh's height