When I embroider a pattern with an outline and an inside region, there is a gap (where nothing is sewn) between the outline and the inside region. When the pattern is checked in the "Preview" screen, no gap appears between them.
Make sure the fabric is set tightly into the hoop.
When embroidering on Stretch or Towel fabrics, try the following:
In the case of Stretch fabric attach an iron on stabilizer material to the bottom surface of the fabric. Follow the instructions provided with the stabilizer.
In the case of Towel fabric place a stabilizer material under the fabric, and hoop the fabric and the stabilizer material together. Also place a stabilizer material on the top surface of the fabric.
If the suggestions mentioned above don’t improve the embroidery, adjust the “Pull Compensation“. Increase the value in “Design Center” or “Layout & Editing”. Refer to your Instruction Manual for detailed instructions on Pull Compensation or Applying Sewing Attributes to Lines and Regions.