Layout value is coming back as an array

[katkat100]

Description

I received an error that a layout value was coming back as an array for a gallery block. I am unsure why this happened as I copied the article to a new article and it worked. How can I prevent this from happening, is it a setting?
The full block is like this
{ "role": "container", "components": [ { "role": "photo", "URL": [url], "layout": "full-width-image-with-caption", "caption": { "format": "html", "text": "<span class="media-credit">", "textStyle": { "fontName": "HelveticaNeue-Italic" } } }, { "role": "caption", "text": "<span class="media-credit">", "format": "html", "textStyle": { "textAlignment": "left", "fontName": "HelveticaNeue-Italic", "fontSize": 13, "tracking": 0, "lineHeight": 16, "textColor": "#484c51" }, "layout": { "margin": { "bottom": 25 } } } ], "layout": [] }

[katkat100]

Hi is there a workaround that someone would know about?