Google Contact's Default Number for MMS

All of my contacts are synced with Google and I created a group on my S5 for MMS messages. When I go to send an MMS message to the group, only three of the members have mobile numbers associated with them and all other recipients have e-mail addresses associated with them. I have verified that all of the contacts have mobile numbers associated with them and Google is syncing them correctly.

Does anybody have a fix for this? I'm sure that I can go to each contact and mark the cell phone number as the primary number, but that seems to only be a temporary fix. I'm curious how this can be fixed, and possibly at the Google level. I have tried to search for an answer but haven't found much.

Any help is appreciated. Thank you!

whtvr said:

how have you verified that? have you tried logging into gmail and checking the contacts/group online?

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I logged into my Google Contacts and confirmed that they all have mobile numbers associated with them. I also exported the contacts to a CSV to look into them more and I can't see any differences between the contacts that automatically have their mobile numbers selected and those where their e-mail address is automatically selected.

Any thoughts?