If your contacts are signed up as only wanting to receive HTML emails and you have also made your sign up form only allow users to subscribe as 'HTML' then you will have a list of contacts that will be stored as 'HTML' contacts.
When you created your autoresponders, if you have set 'Match Format' to 'Text' this will look at all of your contacts and send to only those contacts that have chosen to receive 'Text' emails.
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To fix this, simply change the 'Match Format' option to 'Either'.

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