Hi @eshotsinc 
Try adding content to your POST BODY from the CMS editor rather than the Dynamic Collection manager.
Also, when copying content from your current blog and into the Webflow CMS, make sure to copy it exactly and into Webflow directly. The Rich Text box is supposed to copy over the formatted HTML as well.
​Try these steps and let me know if you’re successful. I’ll be standing by for your response! 
Cheers,
Nelson