Meta Slider Print JS function

Hello,

I am using Meta Slider – Flex Slider with Arrows. However when i post the meta slider on a page a strange “:” comes in front of the meta slider. When i turn of print JS in the advanced section this strange : is gone. However then also my arrows are gone in the slider. How can i fix this?

here is a link to a picture: http://www.vintyman.com/wp-content/uploads/2015/06/screenshot.png

Thank you,

Jeroen

https://ww.wp.xz.cn/plugins/ml-slider/