Do you have code or image examples?
Is the CSS in the right place?
This is the styled button/CTA:
After saving the email as a template and creating a new email from it, this is what I see (default, original template state):
I didn't manually edit the CSS - just used this template option on the right:
If there's a code edit fix or other pointers you have, I appreciate the help.
I should add that I've had this same problem happen using two different templates from Starter Templates.