I found that being repeated on the page, but separated by other shortcodes, Accordion and Notes shortcodes handling leaves garbage (closing tags).
Accordion code work correctly, the Note code also doesn't apply background color to the entire note.
Again it only happens, when there are multiple instances of the same shortcode on the page, and the problem appears from the second instance of the shortcode and further.
I was not able to replicate the issue on our test site.It seems you may have not closed the shrtcodes correctly .
please check :
http://prntscr.com/9f7x2z
I checked it many times before bothering you. I'll come back to this when the project will be online.
Thank you.