Special chars
#1
The command ?a gives 95 chars.

On the hashcat site there are 31.
(assuming that ⇔ is these two characters: < >)

?s = !”#$%&'()*+,-./:;⇔?@[\]^_`{|}~

So 62 + 31 = 93

Is there an error?
#2
<=> is three characters: <, =, and >. the wiki formats it into a single character. i'll fix that.

the last character you are missing is the space character, which is actually the first character in that list on the wiki.
#3
Makes sense, thanks a lot!