Changes in editor not appearing in mobile/tablet view using Blocksy theme

[malalacharm]

Describe the bug
Responsive changes made in the Stackable editor are not reflected in the mobile/tablet preview when using the Blocksy theme.

To Reproduce
Steps to reproduce the behavior:

1. Activate the Blocksy theme
2. Add a stackable block in a page
3. Open the block settings and switch to the Tablet or Mobile responsive view
4. Change a responsive setting, such as spacing, font size, or another design property
5. See error (editor preview is not displaying the edits)

Expected behavior
Changes made to the settings should be immediately reflected in the corresponding tablet/mobile preview.