Text messages being sent to emails instead of mobile...

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For some reason my text messages are being sent to some peoples emails rather than their mobile number. My contacts have a primary number but it also says primary for the email as well and I cant change the email part. I have some contacts in a group and those seem to be the problem ones. I have facebook synced with my contacts.

Is there any way to change it so the mobile number is always the primary for both calling and sending text?

Issue is on my Evo 4G unmodified. Not limited to Evo but I have searched and similar issues arise from android relating to this but no fix I can find.

My wife is having the exact same problem with her Evo. Really having a hard time finding anything on the web on how to fix it. I need to be able to make sending messages via text the primary for her phone.