Well, i think because of the differences in Culture.

If i like for example will live with an Indian or Arab, they have practices that I won't be able to understand or relate to. So adjustment could be difficult. These could even be the cause for misunderstanding.

Unlike if I live with a feloow Filipino, there is very little adjustment because we have same cultural background.

I think that's basically it. But, honestly I don't see any problem in living with people of different nationalities. I look at it as an opportunity to learn new cultures and make friends :)

by the way, I'm a Filipino