html format Preview

Hi, I am using mailpoet for assembling newsletters, and then use the preview to sending from a third party service.
The problem I have is that when I import preview mailpoet (a link) in my service delivery, this Minifying code (or something) and some labels are broken.

This is a snapshot of the preview MailPoet, I marked where skips this line, and when Minifying, having no spaces, tags together and the code is broken.

html preview mailpoet: https://k61.kn3.net/288172EE5.png

html when I import the link in my service delivery: https://k61.kn3.net/1ABBAC255.png

There any way that the html is generated otherwise?

https://www.ads-software.com/plugins/wysija-newsletters/