This was fixed in the latest stable release of Showcase. Looks like the template MERGE didn't work for you on one or more of your STYLES for some reason. Easy fix tho
When you have time, please edit the template (in ALL of your styles)
xa_sc_widget_items_macros
Scroll down to line 95 and see if it looks like this (huge space between the < and xf:macro). Simply remove the space so that it is
<xf:macro id="carousel_macros::setup" /> (as shown in the 2nd image below)
View attachment 10185
It should look like this instead...
View attachment 10186