If you notice that, you should submit for a change. The genres on MDL are misleading, usually, they are inaccurate at all. Most of the time, we take the genres from other databases or users submit it. Moreover, when I watch a movie, I go and update the genres.
The problem is that people usually over add genres. If there is 1 glance/skinship/kiss in the movie, they label it as a romance even if it is just a minor part.
Read this guide to help you learn how to fix mistakes on MDL:
http://mydramalist.com/discussions/support/17285-g...
Edit: This should be in the support forum, not the suggestion. The thread should either be deleted or closed.