Credit forces image to shift in Preview layout.

Activated.

Not sure what you mean by picture shortcode; do you want the link to it? if so here it is:
https://www.quickbeforeitmelts.ca/wp-content/uploads/2015/07/STANDARDS_.jpg

No, I meant the content of the editor “HTML” tab.

Well, I guess I found the problem. Your caption is center-aligned and the CSS wrong IMHO.

If you remove “text-align: center” from .wp-caption, replacing it with “max-width: 100%” and a new rule for .wp-caption-text, things should work.

/* Captions */
.wp-caption { max-width: 100%; }
.wp-caption img { margin: 0; padding: 0; border: 0 none; }
.wp-caption .wp-caption-text { margin: 0; padding: 5px; text-align: center; }
.gallery-caption { margin-left: 0; }

Sorry working at home and had an emergency situation to tend to. Thanks for your help, will look into making the changes when I’m back I front of the computer.

Have you been able to solve this?

I assume this issue has been resolved.

Yes I resolved the issue.