Collapse-O-Matic update from version 1.8.5.5 to 1.8.5.6

Since the update of Collapse-O-Matic from version 1.8.5.5 to 1.8.5.6 (20/04/24) my site has problems. The original code was:

[expand title=”Art in the Drawing Room” rel=”Group-highlander” targclass=”small”]Click here for Group page …….

This now displays as

<span style=”color: rgb(0, 0, 0); font-family: Arial, Helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: 0.2px; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;”>< class=”collapseomatic ” id=”id662655918cb97″ rel=”Group-highlander” tabindex=”0″ title=”Art in the Drawing Room” >Art in the Drawing RoomClick here for Group page<span> </span></span>….

Any advice on how to fix this would be much appreciated.

The page I need help with: [log in to see the link]