Hello there.
I’m writing this post for help anyone looking for information about this problem.
If you set enable “Markdown Auto line breaks” in System configuration, in Grav, you’ll find a blank image extra in the shortcode owl-carousel in your pages.
Example:
Therefore, you have to disable “Markdown Auto line breaks” to this plugin work fine, or write your content without line breaks.
Example with blank image extra:
[owl-carousel items=1 margin=10 loop=true autoplay=true autoplayHoverPause=true nav=true]


[/owl-carousel]
Example without blank image extra and markdown auto line breaks activated:
[owl-carousel items=1 margin=10 loop=true autoplay=true autoplayHoverPause=true nav=true]

[/owl-carousel]
The above images are written without line breaks.
I hope I’ve helped.