new string short?
 

i have a horton tacoma that i bought in august, it came with the black serving string. i recently bought a new horton super string that has the yellowish green serving, but its about an inch shorter than the one on the bow. is this what its supposed to be?, and do i need to add twist in the string? i also noticed that its served almost all the way to the black serving where the end loops are, there is probably about an inch of string showing on each end where the serving stops. thanks for any help.