Yea they aren't broken, settle down, you need to understand what they are.
The 's' otherwise called surround_space is how many empty spaces there are around it.
the 'n' or 'nt' is how many spaces that are NOT the current particles type.
So one particle by itself, both of them will be 8. A particle surround fully by its own type (a big pile) they will both be 0.
To get different numbers for each, it would need to have other types around it.