I'm using K2 included into JM Consilium template - Joomla 3.5
Interest me why accordion from shortcode not work in K2 item pages. (on Joomla articles work normally).
Also I'm using JCE editor.
i.share.pho.to/9fb8fe87_o.png

Hello,

This is related to the accordion extension. You need to address this issue to the extension's developer.