Since migrating my blog to the Soledad theme there is a problem with the new post updates that are sent to my subscribers via MailerLite.

Instead of my subscribers receiving in their mail my newest blog post in its entirety, the email now gives only the first paragraph or so, but in triplicate in the same email. Please see attachment.

I contacted MailerLite and this is their response:

<<Perhaps there could be a different feed URL now that you've changed your theme? Maybe it was updated to a new one? I'm looking at the RSS feed you are using currently, and there seems to be just that one single post in the feed at the moment still. Another possible option would be to use a special plugin that would generate a more extended RSS feed for your blog, which you could then use with MailerLite. You could also perhaps contact the theme author to find out more about how their RSS feed is formed.>>

I would really appreciate your help!  Don’t want to lose my subscribers.