M2M100 sentence not 1OO% Translated

Hi, why when I try to translate this sentences in English to French, M2m100 not translate the last line
Exemple:

When nothing seems to happen, but using a command that works normally. The problem would be the mention?

Expected result:

Quand rien ne semble se passer, mais en utilisant un commandement qui fonctionne normalement. Le problème serait la mention ? 

But it send

Quand rien ne semble se passer, mais en utilisant un commandement qui fonctionne normalement.