Dears, in lesson LingQ 101 - Getting Started the word しませんis divided like し・ませ・ん. Why this division was chosen, since しません has a complete meaning? Please advise

Dears, in lesson LingQ 101 - Getting Started the word しませんis divided like し・ませ・ん. Why this division was chosen, since しません has a complete meaning? Please advise.

Lingq’s algorithm for parsing Japanese words is less than perfect, to put it mildly.