Thread:Vampjrehunter/@comment-5522921-20140902055314/@comment-5522921-20140902061001

Even thought the word some it's in front of it, it doesn't mean that we are talking in plural at all. As forementioned above, we DON'T know the exact reason for them not to show up so we assume it as one reason in general. If you do think it is because of multiple ideas then you could put it as for unknown reasons.

In short, for some reason is acceptable.

You can research about it. https://www.google.co.ve/?gfe_rd=cr&ei=u3BgU8iKD7DQ8gf_voHYCw#q=some+reason+or+reasons