How do I restore image size after processing and exporting from LRC?

This is an old problem, I’ve read, but being new to Topaz and a novice user, I still don’t understand how to restore Topaz processed JPEG images to a size that I can print in Shutterfly without low resolution. Can someone explain the fix in layman terms, please! And, will I have the same problem when I get back to processing my RAW photos?

Steps to reproduce issue:

  1. I transfer a photo from LRC to topaz Ai and sharpen, denoise, etc.
  2. I send back to LRC do some touch up and export.
  3. Shutterfly alerts me that the photo will have low resolution.

Topaz Photo AI [v1.x.x] on [Windows/Mac]